Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock Repurchased During Period, Shares			380,637
Stock Repurchased During Period, Value			$ 8,500
Accelerated Share Repurchases, Final Price Paid Per Share			$ 22.42
Earnings Per Share Reconciliation [Abstract]
Earnings from continuing operations	$ (28,229)	$ 2,116	$ (72,351)	$ 21,815
Fair Value Adjustment of Warrants	(35,000)
Net Income (Loss) Available to Common Stockholders, Diluted	$ (28,229)	$ 2,116	$ (72,351)	$ 21,815
Weighted-average shares outstanding for basic earnings per share (in shares)	58,733,000	59,379,000	58,965,000	62,084,000
Common equivalent shares:
Effect of stock-based compensation awards (in shares)	0	904,000	0	1,940,000
Weighted-average shares outstanding assuming dilution (in shares)	58,733,000	60,283,000	58,965,000	64,024,000
Basic earnings per share from continuing operations (in dollars per share)	$ (0.48)	$ 0.04	$ (1.23)	$ 0.35
Diluted earnings per share from continuing operations (in dollars per share)	$ (0.48)	$ 0.04	$ (1.23)	$ 0.34
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	14,900,000	9,800,000	14,900,000	9,800,000
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrant shares to be issued	8,111,000	0	8,111,000	0