Comprehensive Income (Accumulated Other Comprehensive Income) (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]
Beginning Balance	$ 844	$ (3,500)
Current-period other comprehensive income (loss)	5,410	8,952
Reclassified from accumulated OCI into income	(3,378)	(3,513)
Income tax expense	(326)	(1,095)	(232)
Ending Balance	2,550	844	(3,500)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	208	(1,543)
Current-period other comprehensive income (loss)	1,332	2,231
Income tax expense	(229)	(480)
Ending Balance	1,311	208
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(620)	(664)
Current-period other comprehensive income (loss)	(538)	56
Income tax expense	92	(12)
Ending Balance	(1,066)	(620)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,256	(1,293)
Current-period other comprehensive income (loss)	4,616	6,665
Reclassified from accumulated OCI into income	(3,378)	(3,513)
Income tax expense	(189)	(603)
Ending Balance	$ 2,305	$ 1,256