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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period $ 35,445 $ 49,626 $ 46,663 $ 46,897
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (4,861) (6,579) (15,356) (3,143)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (559) (469) (1,282) (1,176)
Net other comprehensive income (loss) during the period (5,420) (7,048) (16,638) (4,319)
Accumulated other comprehensive income at end of period 30,025 42,578 30,025 42,578
Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 0 (3) (9) (2)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 7 (31) 16 (32)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0 0 0
Net other comprehensive income (loss) during the period 7 (31) 16 (32)
Accumulated other comprehensive income at end of period 7 (34) 7 (34)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 3,935 5,373 2,505 7,250
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax 727 1,763 2,880 593
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax (559) (469) (1,282) (1,176)
Net other comprehensive income (loss) during the period 168 1,294 1,598 (583)
Accumulated other comprehensive income at end of period 4,103 6,667 4,103 6,667
Foreign Currency Translation Adjustment [Member]
        
Other Comprehensive Income [Line Items]        
Accumulated other comprehensive income at beginning of period 31,510 44,256 44,167 39,649
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax (5,595) (8,311) (18,252) (3,704)
Other Comprehensive Income (Loss), Reclassification Adjustments, Net of Tax 0 0 0 0
Net other comprehensive income (loss) during the period (5,595) (8,311) (18,252) (3,704)
Accumulated other comprehensive income at end of period $ 25,915 $ 35,945 $ 25,915 $ 35,945