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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Reconciliation [Line Items]
Net loss	$ 7,799	$ 17,831	$ (4,899)	$ 44,460
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period	46,301	49,865	47,415	49,716
Denominator for diluted earnings per share	46,455	50,330	47,415	50,292
Basic earnings per share	$ 0.17	$ 0.36	$ (0.1)	$ 0.89
Diluted earnings per share	$ 0.17	$ 0.35	$ (0.1)	$ 0.88
Anti-dilutive securities to purchase common shares			300
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to stock-based awards	90	268	0	319
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to stock-based awards	64	197	0	257

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