Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income, Net of Related Tax Effects) (Details)

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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income, Net of Related Tax Effects) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period $ 46,663 $ 46,897 $ 46,715
Other comprehensive income (loss) before reclassifications (7,263) 5,264 (5,250)
Amounts reclassified from other comprehensive income (4,040) (5,498) 5,432
Net other comprehensive income (loss) during the period (11,303) (234) 182
Accumulated other comprehensive income at end of period 35,360 46,663 46,897
Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period (9) (2) 36
Other comprehensive income (loss) before reclassifications 3 (7) (38)
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period 3 (7) (38)
Accumulated other comprehensive income at end of period (6) (9) (2)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period 2,505 7,250 (1,671)
Other comprehensive income (loss) before reclassifications 2,779 753 3,489
Amounts reclassified from other comprehensive income (4,040) (5,498) 5,432
Net other comprehensive income (loss) during the period (1,261) (4,745) 8,921
Accumulated other comprehensive income at end of period 1,244 2,505 7,250
Foreign Currency Translation Adjustment [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period 44,167 39,649 48,350
Other comprehensive income (loss) before reclassifications (10,045) 4,518 (8,701)
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period (10,045) 4,518 (8,701)
Accumulated other comprehensive income at end of period $ 34,122 $ 44,167 $ 39,649