Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	$ (620,270)	$ (438,248)
Amortization	13,539	9,175
Other current period change: Currency translation adjustments and other	(78,414)	(37,350)
Accumulated other comprehensive loss, end of period	(685,145)	(466,423)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	(36,087)	35,875
Amortization	0	0
Other current period change: Currency translation adjustments and other	(73,093)	(35,198)
Accumulated other comprehensive loss, end of period	(109,180)	677
Net Actuarial Loss [Member]
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	(585,941)	(477,883)
Amortization	14,605	11,183
Other current period change: Net actuarial loss and prior service credit	(5,321)	(2,043)
Accumulated other comprehensive loss, end of period	(576,657)	(468,743)
Prior Service Credit [Member]
Accumulated Other Comprehensive (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning of period	1,758	3,760
Amortization	(1,066)	(2,008)
Other current period change: Net actuarial loss and prior service credit	0	(109)
Accumulated other comprehensive loss, end of period	$ 692	$ 1,643