Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			$ (36,790)
Other comprehensive income before reclassifications			(4,300)
Amounts reclassified from accumulated other comprehensive loss			11,626
Other comprehensive (loss) income	$ (228)	$ (22,251)	7,326	$ (25,450)
Balance at September 30, 2015	(29,464)		(29,464)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			(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, 2015	(16,346)		(16,346)
Unrealized Gain (Loss) on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			(990)
Other comprehensive income before reclassifications			1,392
Amounts reclassified from accumulated other comprehensive loss			164
Other comprehensive (loss) income			1,556
Balance at September 30, 2015	566		566
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			(8,345)
Other comprehensive income before reclassifications			(5,692)
Amounts reclassified from accumulated other comprehensive loss			11,462
Other comprehensive (loss) income			5,770
Balance at September 30, 2015	(2,575)		(2,575)
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			(11,109)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive (loss) income			0
Balance at September 30, 2015	$ (11,109)		$ (11,109)