Stockholders' Equity (Changes in AOCI) (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) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			$ (79,433)	$ (2,616)
Other comprehensive (loss) income before reclassifications			(41,318)	(33,462)
Amounts reclassified from accumulated other comprehensive loss			(1,114)	(355)
Other comprehensive loss	$ (1,941)	$ (36,301)	(42,432)	(33,817)
Accumulated other comprehensive income (loss), ending balance	(121,865)	(36,433)	(121,865)	(36,433)
Benefits Liability, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(23,442)	(6,696)
Other comprehensive (loss) income before reclassifications			(128)	(39)
Amounts reclassified from accumulated other comprehensive loss			1,318	422
Other comprehensive loss			1,190	383
Accumulated other comprehensive income (loss), ending balance	(22,252)	(6,313)	(22,252)	(6,313)
Cumulative Foreign Currency Exchange
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(56,224)	3,904
Other comprehensive (loss) income before reclassifications			(43,746)	(37,882)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive loss			(43,746)	(37,882)
Accumulated other comprehensive income (loss), ending balance	(99,970)	(33,978)	(99,970)	(33,978)
Net Unrealized Holding Gains on Investments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			233	176
Other comprehensive (loss) income before reclassifications			2,556	4,459
Amounts reclassified from accumulated other comprehensive loss			(2,432)	(777)
Other comprehensive loss			124	3,682
Accumulated other comprehensive income (loss), ending balance	$ 357	$ 3,858	$ 357	$ 3,858