Summary of Significant Accounting Policies - Reconciliation of the Basic and Diluted EPS Denominators (Details 3) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the basic and diluted EPS denominators
Basic weighted-average common shares	31,051	32,449	32,117
Dilutive effect of common stock options			1
Dilutive effect of restricted common stock	624	569	550
Dilutive effect of 2010 Convertible Notes	1,633	717	205
Dilutive effect of Stock Warrants	130	1
Diluted weighted-average common shares	33,438	33,736	32,873