Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			$ (7,705)
Other comprehensive income before reclassifications			896
Amounts reclassified from accumulated other comprehensive loss			3,587
Other comprehensive income	13,753	11,721	4,483	1,428
Balance at September 30, 2013	(3,222)		(3,222)
Foreign currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(3,024)
Other comprehensive income before reclassifications			4,099
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income			4,099
Balance at September 30, 2013	1,075		1,075
Unrealized gain (loss) on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			2,426
Other comprehensive income before reclassifications			(1,470)
Amounts reclassified from accumulated other comprehensive loss			13
Other comprehensive income			(1,457)
Balance at September 30, 2013	969		969
Unrealized (loss) gain on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(10)
Other comprehensive income before reclassifications			(1,399)
Amounts reclassified from accumulated other comprehensive loss			3,574
Other comprehensive income			2,175
Balance at September 30, 2013	2,165		2,165
Other comprehensive loss on pension liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(7,097)
Other comprehensive income before reclassifications			(334)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income			(334)
Balance at September 30, 2013	$ (7,431)		$ (7,431)