Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	$ (7,705)
Other comprehensive income before reclassifications	9,930
Amounts reclassified from Accumulated other comprehensive income (loss)	2,726
Other comprehensive income (loss)	12,656	3,856	(13,584)
Balance at December 31, 2013	4,951	(7,705)
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	(3,024)
Other comprehensive income before reclassifications	8,482
Amounts reclassified from Accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	8,482
Balance at December 31, 2013	5,458
Unrealized gain (loss) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	2,426
Other comprehensive income before reclassifications	(985)
Amounts reclassified from Accumulated other comprehensive income (loss)	(203)
Other comprehensive income (loss)	(1,188)
Balance at December 31, 2013	1,238
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	(10)
Other comprehensive income before reclassifications	(67)
Amounts reclassified from Accumulated other comprehensive income (loss)	2,929
Other comprehensive income (loss)	2,862
Balance at December 31, 2013	2,852
Other comprehensive gain (loss) on pension liability
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	(7,097)
Other comprehensive income before reclassifications	2,500
Amounts reclassified from Accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	2,500
Balance at December 31, 2013	$ (4,597)