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Shareholders' Equity (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock Repurchase Programs          
Authorized common stock repurchase amount $ 65,000,000        
Amount available to repurchase shares under stock repurchase program       65,000,000  
Accumulated other comprehensive loss          
Balance at the beginning of the period       (29,319,000) (16,018,000)
Other comprehensive income (loss)   5,393,000 (10,211,000) 8,891,000 (9,171,000)
Balance at the end of the period   (20,428,000) (25,189,000) (20,428,000) (25,189,000)
Foreign Currency Translation Adjustments
         
Accumulated other comprehensive loss          
Balance at the beginning of the period       (29,319,000) (16,130,000)
Other comprehensive income (loss)       8,891,000 (9,096,000)
Balance at the end of the period   (20,428,000) (25,226,000) (20,428,000) (25,226,000)
Cash Flow Hedges
         
Accumulated other comprehensive loss          
Balance at the beginning of the period         112,000
Other comprehensive income (loss)         (75,000)
Balance at the end of the period     $ 37,000   $ 37,000