Accumulated Other Comprehensive Income (Loss) by Component (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 20,259	$ 131,846	$ 71,619	$ 125,156
OCI before reclassifications	(7,129)	(4,682)	(58,388)	1,824
Amount reclassified from accumulated OCI	(593)	405	(694)	589
Other Comprehensive Income (Loss)	(7,722)	(4,277)	(59,082)	2,413
Ending Balance	12,537	127,569	12,537	127,569
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	18,082	149,948	86,236	143,845
OCI before reclassifications	383	(12,596)	(67,771)	(6,493)
Amount reclassified from accumulated OCI	0	0	0	0
Other Comprehensive Income (Loss)	383	(12,596)	(67,771)	(6,493)
Ending Balance	18,465	137,352	18,465	137,352
Accumulated Long-Term Notes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	8,311	(12,021)	(6,465)	(12,566)
OCI before reclassifications	(7,065)	7,660	7,711	8,205
Amount reclassified from accumulated OCI	0	0	0	0
Other Comprehensive Income (Loss)	(7,065)	7,660	7,711	8,205
Ending Balance	1,246	(4,361)	1,246	(4,361)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(7,507)	(4,872)	(7,601)	(5,414)
OCI before reclassifications	(68)	(48)	(15)	436
Amount reclassified from accumulated OCI	3	65	44	123
Other Comprehensive Income (Loss)	(65)	17	29	559
Ending Balance	(7,572)	(4,855)	(7,572)	(4,855)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	1,373	(1,209)	(551)	(709)
OCI before reclassifications	(379)	302	1,687	(324)
Amount reclassified from accumulated OCI	(596)	340	(738)	466
Other Comprehensive Income (Loss)	(975)	642	949	142
Ending Balance	$ 398	$ (567)	$ 398	$ (567)