Accumulated Other Comprehensive Income (Loss) by Component (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 10,188	$ 12,537	$ (9,387)	$ 71,619
OCI before reclassifications	(3,143)	3,616	16,730	(54,772)
Amount reclassified from accumulated OCI	(468)	284	(766)	(410)
Other Comprehensive Income (Loss)	(3,611)	3,900	15,964	(55,182)
Ending Balance	6,577	16,437	6,577	16,437
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	16,456	18,465	(5,744)	86,236
OCI before reclassifications	(14,398)	15,386	7,802	(52,385)
Amount reclassified from accumulated OCI	0	0	0	0
Other Comprehensive Income (Loss)	(14,398)	15,386	7,802	(52,385)
Ending Balance	2,058	33,851	2,058	33,851
Accumulated Long-Term Notes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	2,987	1,246	4,111	(6,465)
OCI before reclassifications	10,990	(10,868)	9,866	(3,157)
Amount reclassified from accumulated OCI	0	0	0	0
Other Comprehensive Income (Loss)	10,990	(10,868)	9,866	(3,157)
Ending Balance	13,977	(9,622)	13,977	(9,622)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(9,953)	(7,572)	(9,757)	(7,601)
OCI before reclassifications	(563)	(69)	(835)	(84)
Amount reclassified from accumulated OCI	230	3	306	47
Other Comprehensive Income (Loss)	(333)	(66)	(529)	(37)
Ending Balance	(10,286)	(7,638)	(10,286)	(7,638)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	698	398	2,003	(551)
OCI before reclassifications	828	(833)	(103)	854
Amount reclassified from accumulated OCI	(698)	281	(1,072)	(457)
Other Comprehensive Income (Loss)	130	(552)	(1,175)	397
Ending Balance	$ 828	$ (154)	$ 828	$ (154)