Accumulated Other Comprehensive Income (Loss) by Component (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (19,335)	$ (9,387)
OCI before reclassifications	1,208	11,702
Amount reclassified from accumulated OCI	(89)	(161)
Other Comprehensive Income	1,119	11,541
Ending Balance	(18,216)	2,154
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(26,199)	(5,744)
OCI before reclassifications	(2,153)	12,218
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income	(2,153)	12,218
Ending Balance	(28,352)	6,474
Accumulated Long-Term Notes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	17,372	4,111
OCI before reclassifications	3,102	(1,449)
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income	3,102	(1,449)
Ending Balance	20,474	2,662
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(11,248)	(9,757)
OCI before reclassifications	(505)	(195)
Amount reclassified from accumulated OCI	210	5
Other Comprehensive Income	(295)	(190)
Ending Balance	(11,543)	(9,947)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	740	2,003
OCI before reclassifications	764	1,128
Amount reclassified from accumulated OCI	(299)	(166)
Other Comprehensive Income	465	962
Ending Balance	$ 1,205	$ 2,965