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, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income at beginning of period	$ 35,360	$ 46,663	$ 46,897
Other comprehensive income (loss) before reclassifications	(17,816)	(7,263)	5,264
Amounts reclassified from other comprehensive income	(1,711)	(4,040)	(5,498)
Net other comprehensive income (loss) during the period	(19,527)	(11,303)	(234)
Accumulated other comprehensive income at end of period	15,833	35,360	46,663
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	(6)	(9)	(2)
Other comprehensive income (loss) before reclassifications	10	3	(7)
Amounts reclassified from other comprehensive income	0	0	0
Net other comprehensive income (loss) during the period	10	3	(7)
Accumulated other comprehensive income at end of period	4	(6)	(9)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income at beginning of period	1,244	2,505	7,250
Other comprehensive income (loss) before reclassifications	9,462	2,779	753
Amounts reclassified from other comprehensive income	(1,711)	(4,040)	(5,498)
Net other comprehensive income (loss) during the period	7,751	(1,261)	(4,745)
Accumulated other comprehensive income at end of period	8,995	1,244	2,505
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income at beginning of period	34,122	44,167	39,649
Other comprehensive income (loss) before reclassifications	(27,288)	(10,045)	4,518
Amounts reclassified from other comprehensive income	0	0	0
Net other comprehensive income (loss) during the period	(27,288)	(10,045)	4,518
Accumulated other comprehensive income at end of period	$ 6,834	$ 34,122	$ 44,167