Shareholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	$ (204,672)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	66,146	$ (8,367)	$ (25,827)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(138,526)	(204,672)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(204,672)	(196,305)	(170,478)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	5,391	3,017	(24,602)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	60,755	(11,384)	(1,225)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	66,146	(8,367)	(25,827)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(138,526)	(204,672)	(196,305)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(157,999)	(157,489)	(128,648)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	21,082	(2,953)	(28,841)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	52,074	2,443	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	73,156	(510)	(28,841)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(84,843)	(157,999)	(157,489)
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	(723)	1,201	966
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(7,002)	4,061	2,586
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6,104	(5,985)	(2,351)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(898)	(1,924)	235
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(1,621)	(723)	1,201
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	(31,570)	(25,637)	(28,416)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(8,689)	1,909	1,653
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,577	(7,842)	1,126
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(6,112)	(5,933)	2,779
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	$ (37,682)	$ (31,570)	$ (25,637)