Earnings (Loss) Per Share - Reconciliation of Shares Used in Calculating Earnings Per Basic and Diluted Shares (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average common shares outstanding—basic (in shares)	25,450	25,879	25,800	25,811
Dilutive effect of stock-based awards (in shares)	0	410	265	684
Dilutive effect of convertible senior notes (in shares)	0	1,043	847	1,118
Dilutive effect of warrants (in shares)	0	0	0	9
Weighted average common shares outstanding—diluted (in shares)	25,450	27,332	26,912	27,622