Shareholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	$ (196,305)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(8,367)	$ (25,827)	$ 58,849
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(204,672)	(196,305)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(196,305)	(170,478)	(229,327)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3,017	(24,602)	56,568
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(11,384)	(1,225)	2,281
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(8,367)	(25,827)	58,849
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(204,672)	(196,305)	(170,478)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(157,489)	(128,648)	(182,986)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,953)	(28,841)	53,854
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,443	0	484
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(510)	(28,841)	54,338
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(157,999)	(157,489)	(128,648)
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	1,201	966	43
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,061	2,586	360
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(5,985)	(2,351)	563
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,924)	235	923
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(723)	1,201	966
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 Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(25,637)	(28,416)	(32,004)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,909	1,653	2,354
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(7,842)	1,126	1,234
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(5,933)	2,779	3,588
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	$ (31,570)	$ (25,637)	$ (28,416)