Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	$ (200,607)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(28,720)	$ (65,547)	$ (113,756)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(229,327)	(200,607)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(200,607)	(135,060)	(21,304)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(30,848)	(69,245)	(115,565)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,128	3,698	1,809
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(28,720)	(65,547)	(113,756)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(229,327)	(200,607)	(135,060)
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(14,380)	(14,380)	(14,380)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(14,380)	(14,380)	(14,380)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	318	(768)	(1,256)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,087)	76	(566)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	812	1,010	1,054
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(275)	1,086	488
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	43	318	(768)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(158,009)	(85,080)	4,217
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(23,570)	(73,891)	(89,297)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,407)	962	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(24,977)	(72,929)	(89,297)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(182,986)	(158,009)	(85,080)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(28,536)	(34,832)	(9,885)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(6,191)	4,570	(25,702)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,723	1,726	755
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,468)	6,296	(24,947)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	$ (32,004)	$ (28,536)	$ (34,832)