Earnings Per Common Share - Reconciliation of the Basic and Diluted EPS Denominators (Details) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Reconciliation of the basic and diluted EPS denominators
Basic weighted-average common shares	31,542	32,319
Dilutive effect of restricted common stock	658	750
Dilutive effect of 2010 Convertible Notes	1,093	966
Dilutive effect of Stock Warrants	47
Diluted weighted-average common shares	33,340	34,035

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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