Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014	$ (36,790)
Other comprehensive income (loss) before reclassifications	(4,934)
Amounts reclassified from Accumulated other comprehensive loss	13,197
Other comprehensive income (loss)	8,263	$ (41,741)	$ 12,656
Balance at December 31, 2015	(28,527)	(36,790)
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014	(16,346)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from Accumulated other comprehensive loss	0
Other comprehensive income (loss)	0
Balance at December 31, 2015	(16,346)	(16,346)
Unrealized gain (loss) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014	(990)
Other comprehensive income (loss) before reclassifications	(2,080)
Amounts reclassified from Accumulated other comprehensive loss	170
Other comprehensive income (loss)	(1,910)
Balance at December 31, 2015	(2,900)	(990)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014	(8,345)
Other comprehensive income (loss) before reclassifications	(6,937)
Amounts reclassified from Accumulated other comprehensive loss	13,027
Other comprehensive income (loss)	6,090
Balance at December 31, 2015	(2,255)	(8,345)
Other comprehensive loss on pension liability
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2014	(11,109)
Other comprehensive income (loss) before reclassifications	4,083
Amounts reclassified from Accumulated other comprehensive loss	0
Other comprehensive income (loss)	4,083
Balance at December 31, 2015	$ (7,026)	$ (11,109)