Other Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (238,038)	$ (76,029)	$ (212,949)	$ (35,036)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13,547	(445)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(39,509)	(42,809)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	873	2,261
Other Comprehensive Income (Loss), Net of Tax	(25,089)	(40,993)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(45,783)	30,432	(4,960)	77,915
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(40,823)	(47,483)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	(40,823)	(47,483)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,689	(1,773)	(1,944)	(2,433)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13,547	(445)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1,832)	30
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6,082)	1,075
Other Comprehensive Income (Loss), Net of Tax	5,633	660
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(195,944)	(104,688)	$ (206,045)	$ (110,518)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	3,146	4,644
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6,955	1,186
Other Comprehensive Income (Loss), Net of Tax	$ 10,101	$ 5,830