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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period $ 30,025 $ 42,578 $ 46,663 $ 46,897
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 10,133 7,602 (5,223) 4,459
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (2,253) (2,633) (3,535) (3,809)
Net other comprehensive income (loss) during the period 7,880 4,969 (8,758) 650
Accumulated other comprehensive income at end of period 37,905 47,547 37,905 47,547
Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 7 (34) (9) (2)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (9) 32 7 0
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0 0 0
Net other comprehensive income (loss) during the period (9) 32 7 0
Accumulated other comprehensive income at end of period (2) (2) (2) (2)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 4,103 6,667 2,505 7,250
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (951) (736) 1,929 (143)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (2,253) (2,633) (3,535) (3,809)
Net other comprehensive income (loss) during the period (3,204) (3,369) (1,606) (3,952)
Accumulated other comprehensive income at end of period 899 3,298 899 3,298
Foreign Currency Translation Adjustment [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 25,915 35,945 44,167 39,649
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 11,093 8,306 (7,159) 4,602
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0 0 0
Net other comprehensive income (loss) during the period 11,093 8,306 (7,159) 4,602
Accumulated other comprehensive income at end of period $ 37,008 $ 44,251 $ 37,008 $ 44,251