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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period $ 30,209 $ 35,445 $ 35,360 $ 46,663
Other comprehensive income (loss) before reclassifications 8,269 (4,861) 3,594 (15,356)
Amounts reclassified from other comprehensive income (403) (559) (879) (1,282)
Net other comprehensive income (loss) during the period 7,866 (5,420) 2,715 (16,638)
Accumulated other comprehensive income at end of period 38,075 30,025 38,075 30,025
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 (5) 0 (6) (9)
Other comprehensive income (loss) before reclassifications 3 7 4 16
Amounts reclassified from other comprehensive income 0 0 0 0
Net other comprehensive income (loss) during the period 3 7 4 16
Accumulated other comprehensive income at end of period (2) 7 (2) 7
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period 1,472 3,935 1,244 2,505
Other comprehensive income (loss) before reclassifications (634) 727 70 2,880
Amounts reclassified from other comprehensive income (403) (559) (879) (1,282)
Net other comprehensive income (loss) during the period (1,037) 168 (809) 1,598
Accumulated other comprehensive income at end of period 435 4,103 435 4,103
Foreign Currency Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) at beginning of period 28,742 31,510 34,122 44,167
Other comprehensive income (loss) before reclassifications 8,900 (5,595) 3,520 (18,252)
Amounts reclassified from other comprehensive income 0 0 0 0
Net other comprehensive income (loss) during the period 8,900 (5,595) 3,520 (18,252)
Accumulated other comprehensive income at end of period $ 37,642 $ 25,915 $ 37,642 $ 25,915