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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share Reconciliation [Line Items]
Net income	$ 5,598	$ 14,513
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period	57,484,000	60,919,000
Denominator for diluted earnings per share	57,853,000	61,482,000
Basic earnings per share	$ 0.10	$ 0.24
Diluted earnings per share	$ 0.10	$ 0.24
Options to purchase of common shares	3,400,000	2,700,000
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of outstanding dilutive options	212,000	444,000
Restricted Shares, Restricted Stock Units And Phantom Stock [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to outstanding restricted shares, restricted stock units and phantom stock	157,000	119,000

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