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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share Reconciliation [Line Items]
Net loss	$ 10,943	$ 18,074	$ (12,698)	$ 26,629
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period	47,451	49,766	47,981	49,640
Denominator for diluted earnings per share	47,631	50,239	47,981	50,209
Basic earnings per share	$ 0.23	$ 0.36	$ (0.26)	$ 0.54
Diluted earnings per share	$ 0.23	$ 0.36	$ (0.26)	$ 0.53
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	116	318	0	341
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to stock-based awards	64	155	0	228

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Earnings Per Share Reconciliation [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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