Earnings Per Common Share - Reconciliation of the Basic and Diluted EPS Denominators (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of the basic and diluted EPS denominators
Basic weighted-average common shares	30,798	32,619	31,170	32,469
Dilutive effect of restricted common stock	564	370	610	560
Dilutive effect of 2010 Convertible Notes	1,605	554	1,349	760
Dilutive effect of Stock Warrants	128		88
Diluted weighted-average common shares	33,095	33,543	33,217	33,789