Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			$ 834,388
Other comprehensive income (loss)	$ (29,285)	$ 9,676	(21,138)	$ 3,160
Balance at end of period	838,070		838,070
Accumulated defined benefit plans adjustment attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(55,032)	(111,840)	(57,296)	(115,552)
Tax benefit	(950)	(1,139)	(1,966)	(2,223)
Reclassification from accumulated other comprehensive loss into net income	2,330	3,657	4,594	7,369
Balance at end of period	(52,702)	(108,183)	(52,702)	(108,183)
Accumulated defined benefit plans adjustment, net prior service attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	(48)	(24)	(96)	(48)
Accumulated defined benefit plans adjustment, net gain (loss) attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	3,328	4,820	6,656	9,640
Accumulated defined benefit plans adjustment attributable to noncontrolling interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0	0	0
Tax benefit	0	0	0	0
Reclassification from accumulated other comprehensive loss into net income	0	0	0	0
Balance at end of period	0	0	0	0
Accumulated defined benefit plans adjustment, net prior service attributable to noncontrolling interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Accumulated defined benefit plans adjustment, net gain (loss) attributable to noncontrolling interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Accumulated net investment gain (loss) attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(14)	(6)	(5)	(1)
Other comprehensive income (loss)	(9)	1	(18)	(4)
Balance at end of period	(23)	(5)	(23)	(5)
Accumulated net investment gain (loss) attributable to noncontrolling interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Balance at end of period	0	0	0	0
Accumulated foreign currency adjustment attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(85,947)	(77,102)	(91,839)	(66,844)
Other comprehensive income (loss)	(31,606)	6,145	(25,714)	(4,113)
Balance at end of period	(117,553)	(70,957)	(117,553)	(70,957)
Accumulated foreign currency adjustment attributable to noncontrolling interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	617	0	582
Other comprehensive income (loss)	0	(127)	0	(92)
Balance at end of period	$ 0	$ 490	$ 0	$ 490