Accumulated Other Comprehensive Income (Loss) by Component - Changes in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 71,619	$ 125,156
OCI before reclassifications	(80,151)	(54,169)
Amount reclassified from accumulated OCI	(855)	632
Other Comprehensive Income (Loss)	(81,006)	(53,537)	$ 12,413
Ending balance	(9,387)	71,619	125,156
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	86,236	143,845
OCI before reclassifications	(91,980)	(57,609)
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	(91,980)	(57,609)
Ending balance	(5,744)	86,236	143,845
Long-Term Notes
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(6,465)	(12,566)
OCI before reclassifications	10,576	6,101
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	10,576	6,101
Ending balance	4,111	(6,465)	(12,566)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(7,601)	(5,414)
OCI before reclassifications	(2,292)	(3,223)
Amount reclassified from accumulated OCI	136	1,036
Other Comprehensive Income (Loss)	(2,156)	(2,187)
Ending balance	(9,757)	(7,601)	(5,414)
Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(551)	(709)
OCI before reclassifications	3,545	562
Amount reclassified from accumulated OCI	(991)	(404)
Other Comprehensive Income (Loss)	2,554	158
Ending balance	$ 2,003	$ (551)	$ (709)