Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			$ (28,527)
Other comprehensive income before reclassifications			5,249
Amounts reclassified from accumulated other comprehensive loss			443
Other comprehensive (loss) income	$ (934)	$ (228)	5,692	$ 7,326
Balance at September 30, 2016	(22,835)		(22,835)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(16,346)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive (loss) income			0
Balance at September 30, 2016	(16,346)		(16,346)
Unrealized Gain (Loss) on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(2,900)
Other comprehensive income before reclassifications			4,863
Amounts reclassified from accumulated other comprehensive loss			(1,220)
Other comprehensive (loss) income			3,643
Balance at September 30, 2016	743		743
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(2,255)
Other comprehensive income before reclassifications			386
Amounts reclassified from accumulated other comprehensive loss			1,663
Other comprehensive (loss) income			2,049
Balance at September 30, 2016	(206)		(206)
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(7,026)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive (loss) income			0
Balance at September 30, 2016	$ (7,026)		$ (7,026)