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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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Reconciliation [Line Items]
Net income (loss)	$ 21,210	$ 22,150	$ 35,415	$ 41,275
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period	52,180	53,826	52,321	53,738
Denominator for diluted earnings per share	52,671	54,405	52,884	54,394
Basic earnings per share	$ 0.41	$ 0.41	$ 0.68	$ 0.77
Diluted earnings per share	$ 0.4	$ 0.41	$ 0.67	$ 0.76
Anti-dilutive options to purchase common shares	1,000	700	1,000	700
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to stock-based awards	386	443	387	461
Restricted Shares And Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to stock-based awards	105	136	176	195

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