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
Mar. 31, 2013
Mar. 31, 2012
Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income at beginning of period $ 46,663 $ 46,897
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (10,495) 3,436
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (723) (707)
Other comprehensive income (loss) (11,218) 2,729
Accumulated other comprehensive income at end of period 35,445 49,626
Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]
    
Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income at beginning of period (9) (2)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 9 (1)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0
Other comprehensive income (loss) 9 (1)
Accumulated other comprehensive income at end of period 0 (3)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
    
Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income at beginning of period 2,505 7,250
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 2,153 (1,170)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (723) (707)
Other comprehensive income (loss) 1,430 (1,877)
Accumulated other comprehensive income at end of period 3,935 5,373
Foreign Currency Translation Adjustment [Member]
    
Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income at beginning of period 44,167 39,649
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (12,657) 4,607
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0
Other comprehensive income (loss) (12,657) 4,607
Accumulated other comprehensive income at end of period $ 31,510 $ 44,256