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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | 11. Earnings Per Share The Company calculates earnings per share using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. Participating secur ities consist of nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. A summary of the information used in the computation of earnings per common share follows. ﻿
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﻿ |  | Three Months Ended
﻿ |  | March 31,
﻿(in thousands, except per share data) |  | 2018 |  | 2017
﻿Numerator: |  |  |  |  |  |
﻿Net income to common shareholders |  | $ | 72,475 |  | $ | 49,014
﻿Net income allocated to participating securities - basic and diluted |  |  | 1,366 |  |  | 1,156
﻿Net income allocated to common shareholders - basic and diluted |  | $ | 71,109 |  | $ | 47,858
﻿Denominator: |  |  |  |  |  |
﻿Weighted-average common shares - basic |  | $ | 85,241 |  | $ | 84,365
﻿Dilutive potential common shares |  |  | 182 |  |  | 259
﻿Weighted-average common shares - diluted |  | $ | 85,423 |  | $ | 84,624
﻿Earnings per common share: |  |  |  |  |  |
﻿Basic |  | $ | 0.83 |  | $ | 0.57
﻿Diluted |  | $ | 0.83 |  | $ | 0.57
﻿ Potential common shares consist of stock options, nonvested performance-based awards, and nonvested restricted share awards deferred under the Company’s nonqualified deferred compensation plan. These potential co mmon shares do not enter into the calculation of diluted earnings per share if the impact would be anti-dilutive, i.e., increase earnings per share or redu ce a loss per share. There were no anti-dilutive potential common shares excluded from the calculation of diluted earnings per share for the three months ended March 31, 2018. Weighted average anti-dilutive potential common shares totaled 15,986 for the three months ended March 31, 2017.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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