in effect for the year in which those temporary differences are expected to be realized or settled. The effect on the deferred tax assets and liabilities from a change in tax rates is recognized in earnings in the period when the new rate is enacted. However, deferred tax assets are recognized only to the extent that it is more likely than not that they will be realized based on consideration of all available evidence, including the future reversals of existing taxable temporary differences, future projected taxable income and tax planning strategies. Valuation allowances are provided if, based upon the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
The Company performs an annual review for any uncertain tax positions and, if necessary, will record the expected future tax consequences of uncertain tax positions in the consolidated financial statements.
Earnings Per Common Share
Basic earnings per common share is calculated by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding during the period excluding the weighted-average number of unvested restricted shares and performance units outstanding during the period. Diluted earnings per common share is calculated by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding during the period, plus any shares that could potentially be outstanding during the period. The potential shares consist of unvested restricted share grants and unvested performance units, calculated using the treasury stock method. Any anti-dilutive shares have been excluded from the diluted earnings per common share calculation.
The Company may issue share-based awards as compensation to officers, employees, non-employee trustees and other eligible persons under the RLJ Lodging Trust 2015 Equity Incentive Plan (the "2015 Plan"). The vesting of the awards issued to the officers and employees is based on either the continued employment (time-based) or the relative total shareholder returns of the Company and continued employment (performance-based), as determined by the board of trustees at the date of grant. For time-based awards, the Company recognizes compensation expense for the unvested restricted shares on a straight-line basis over the vesting period based upon the fair market value of the shares on the date of grant, adjusted for forfeitures. For performance-based awards, the Company recognizes compensation expense over the requisite service period for each award, based on the fair market value of the shares on the date of grant, as determined using a Monte Carlo simulation, adjusted for forfeitures.
Non-employee trustees may elect to receive unrestricted shares under the 2015 Plan as compensation that would otherwise be paid in cash for their services. The shares issued to the non-employee trustees in lieu of cash compensation are unrestricted and include no vesting conditions. The Company recognizes compensation expense for the unrestricted shares issued in lieu of cash compensation based upon the fair market value of the shares on the date of issuance.
Recently Issued Accounting Pronouncements
In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which provides the principles for the recognition, measurement, presentation, and disclosure of leases for both parties to a contract (i.e. lessees and lessors). Lessees will recognize a right-of-use asset and a lease liability for most of their leases on the balance sheet. A lessee will need to classify its leases as either an operating lease or a finance lease based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether lease expense is recognized on a straight-line basis over the term of the lease or on the effective interest method. Leases with a term of 12 months or less will be accounted for similar to the existing accounting guidance today in ASC 840, Leases, for operating leases. Lessors will classify their leases using an approach that is substantially equivalent to the existing accounting guidance today for operating, direct financing, or sales-type leases. Lessors may only capitalize the incremental direct costs of leasing, so any indirect costs of leasing will be expensed as incurred.
The guidance is effective for annual reporting periods beginning after December 15, 2018, and the interim periods within those annual periods. The Company adopted this standard on January 1, 2019 using the modified retrospective transition approach. There are two methods of applying the modified retrospective transition approach and the Company elected to not adjust the comparative periods in the consolidated financial statements and footnotes, so the Company did not recognize a cumulative effect adjustment on the date of adoption. The comparative periods will be presented in accordance with ASC 840.