Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,221,168	$ 840,273	$ 795,495	$ 800,815	$ 840,273	$ 800,815
OCI before reclassifications					(8,747)	(15,966)
Amounts reclassified from AOCI					2,101	52,811
Total other comprehensive income (loss), net of tax	5,137	(11,783)	62,056	(25,211)	(6,646)	36,845
Ending balance	1,200,658	1,221,168	802,869	795,495	1,200,658	802,869
Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,196,466	816,548	770,740	776,538	816,548	776,538
Total other comprehensive income (loss), net of tax	5,137	(11,783)	62,056	(25,211)
Ending balance	1,175,278	1,196,466	777,799	770,740	1,175,278	777,799
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(84,843)		(157,999)	(84,843)	(157,999)
OCI before reclassifications					(9,354)	(14,135)
Amounts reclassified from AOCI					0	52,088
Total other comprehensive income (loss), net of tax					(9,354)	37,953
Ending balance	(94,197)		(120,046)		(94,197)	(120,046)
Net Unrealized Gain (Loss) on Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(1,621)		(723)	(1,621)	(723)
OCI before reclassifications					607	(1,914)
Amounts reclassified from AOCI					701	(242)
Total other comprehensive income (loss), net of tax					1,308	(2,156)
Ending balance	(313)		(2,879)		(313)	(2,879)
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)	(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)		(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)	(37,682)	(31,570)
OCI before reclassifications					0	83
Amounts reclassified from AOCI					1,400	965
Total other comprehensive income (loss), net of tax					1,400	1,048
Ending balance	(36,282)		(30,522)		(36,282)	(30,522)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ (138,526)		$ (204,672)	(138,526)	(204,672)
Ending balance	$ (145,172)		$ (167,827)		$ (145,172)	$ (167,827)