Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014			$ (36,790)
Other comprehensive income before reclassifications			(2,046)
Amounts reclassified from accumulated other comprehensive loss			9,600
Other comprehensive income (loss)	$ 6,736	$ (2,498)	7,554	$ (3,199)
Balance at June 30, 2015	(29,236)		(29,236)
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 income (loss)			0
Balance at June 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			1,298
Amounts reclassified from accumulated other comprehensive loss			(68)
Other comprehensive income (loss)			1,230
Balance at June 30, 2015	240		240
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			(3,344)
Amounts reclassified from accumulated other comprehensive loss			9,668
Other comprehensive income (loss)			6,324
Balance at June 30, 2015	(2,021)		(2,021)
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 income (loss)			0
Balance at June 30, 2015	$ (11,109)		$ (11,109)