Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Details)

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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period $ 38,075 $ 30,025 $ 35,360 $ 46,663
Other comprehensive income (loss) before reclassifications (10,673) 10,133 (7,079) (5,223)
Amounts reclassified from other comprehensive income (306) (2,253) (1,185) (3,535)
Net other comprehensive income (loss) during the period (10,979) 7,880 (8,264) (8,758)
Accumulated other comprehensive income at end of period 27,096 37,905 27,096 37,905
Unrealized Gains (Losses) on Available-For-Sale Securities [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period (2) 7 (6) (9)
Other comprehensive income (loss) before reclassifications 0 (9) 4 7
Amounts reclassified from other comprehensive income 0 0 0 0
Net other comprehensive income (loss) during the period 0 (9) 4 7
Accumulated other comprehensive income at end of period (2) (2) (2) (2)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period 435 4,103 1,244 2,505
Other comprehensive income (loss) before reclassifications 5,404 (951) 5,474 1,929
Amounts reclassified from other comprehensive income (306) (2,253) (1,185) (3,535)
Net other comprehensive income (loss) during the period 5,098 (3,204) 4,289 (1,606)
Accumulated other comprehensive income at end of period 5,533 899 5,533 899
Foreign Currency Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period 37,642 25,915 34,122 44,167
Other comprehensive income (loss) before reclassifications (16,077) 11,093 (12,557) (7,159)
Amounts reclassified from other comprehensive income 0 0 0 0
Net other comprehensive income (loss) during the period (16,077) 11,093 (12,557) (7,159)
Accumulated other comprehensive income at end of period $ 21,565 $ 37,008 $ 21,565 $ 37,008