Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 840,273	$ 800,815
OCI before reclassifications	(11,603)	(24,629)
Amounts reclassified from AOCI	(180)	(582)
Total other comprehensive income (loss), net of tax	(11,783)	(25,211)
Ending balance	1,221,168	795,495
Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	816,548	776,538
Total other comprehensive income (loss), net of tax	(11,783)	(25,211)
Ending balance	1,196,466	770,740
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(84,843)	(157,999)
OCI before reclassifications	(15,012)	(25,445)
Amounts reclassified from AOCI	0	0
Total other comprehensive income (loss), net of tax	(15,012)	(25,445)
Ending balance	(99,855)	(183,444)
Net Unrealized Gain (Loss) on Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,621)	(723)
OCI before reclassifications	3,409	282
Amounts reclassified from AOCI	(881)	(1,049)
Total other comprehensive income (loss), net of tax	2,528	(767)
Ending balance	907	(1,490)
Net Unrealized Gain (Loss) on Nonderivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(14,380)	(14,380)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Total other comprehensive income (loss), net of tax	0	0
Ending balance	(14,380)	(14,380)
Pension Benefit Obligation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(37,682)	(31,570)
OCI before reclassifications	0	534
Amounts reclassified from AOCI	701	467
Total other comprehensive income (loss), net of tax	701	1,001
Ending balance	(36,981)	(30,569)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(138,526)	(204,672)
Ending balance	$ (150,309)	$ (229,883)