Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,200,658	$ 1,221,168	$ 840,273	$ 802,869	$ 795,495	$ 800,815	$ 840,273	$ 800,815
OCI before reclassifications							(16,033)	(6,025)
Amounts reclassified from AOCI							2,820	56,684
Total other comprehensive income (loss), net of tax	(6,567)	5,137	(11,783)	13,814	62,056	(25,211)	(13,213)	50,659
Ending balance	1,199,826	1,200,658	1,221,168	797,265	802,869	795,495	1,199,826	797,265
Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,175,278	1,196,466	816,548	777,799	770,740	776,538	816,548	776,538
Total other comprehensive income (loss), net of tax	(6,567)	5,137	(11,783)	13,814	62,056	(25,211)
Ending balance	1,173,587	$ 1,175,278	1,196,466	771,896	$ 777,799	770,740	1,173,587	771,896
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							(17,118)	(147)
Amounts reclassified from AOCI							0	52,074
Total other comprehensive income (loss), net of tax							(17,118)	51,927
Ending balance	(101,961)			(106,072)			(101,961)	(106,072)
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							1,085	(4,727)
Amounts reclassified from AOCI							733	2,570
Total other comprehensive income (loss), net of tax							1,818	(2,157)
Ending balance	197			(2,880)			197	(2,880)
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	(1,151)
Amounts reclassified from AOCI							2,087	2,040
Total other comprehensive income (loss), net of tax							2,087	889
Ending balance	(35,595)			(30,681)			(35,595)	(30,681)
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	$ (151,739)			$ (154,013)			$ (151,739)	$ (154,013)