Accumulated Other Comprehensive Income (Loss) by Component (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (9,387)	$ 71,619
OCI before reclassifications	11,702	(51,259)
Amount reclassified from accumulated OCI	(161)	(101)
Other Comprehensive Income (Loss)	11,541	(51,360)
Ending Balance	2,154	20,259
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(5,744)	86,236
OCI before reclassifications	12,218	(68,154)
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	12,218	(68,154)
Ending Balance	6,474	18,082
Accumulated Long-Term Notes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	4,111	(6,465)
OCI before reclassifications	(1,449)	14,776
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	(1,449)	14,776
Ending Balance	2,662	8,311
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(9,757)	(7,601)
OCI before reclassifications	(195)	53
Amount reclassified from accumulated OCI	5	41
Other Comprehensive Income (Loss)	(190)	94
Ending Balance	(9,947)	(7,507)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	2,003	(551)
OCI before reclassifications	1,128	2,066
Amount reclassified from accumulated OCI	(166)	(142)
Other Comprehensive Income (Loss)	962	1,924
Ending Balance	$ 2,965	$ 1,373