Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ 1,132,083	$ 1,020,639	$ 1,195,655	$ 876,764
Other comprehensive income (loss) before reclassifications			(1,405)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(2,147)	(26)	(4,341)	(11,486)
Other comprehensive income (loss)		4,015	(1,379)	(14,999)	(1,233)
Ending Balance		1,137,227	1,011,350	1,137,227	1,011,350
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(26,245)	(6,241)	(7,231)	(6,387)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(2,147)	(26)	(4,341)	(11,486)
Ending Balance		(22,230)	(7,620)	(22,230)	(7,620)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(2,325)	(976)	1,065	(11,550)
Other comprehensive income (loss) before reclassifications		2,351	1,600	(1,039)	508
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	0	0	0	11,666
Other comprehensive income (loss)		2,351	1,600	(1,039)	12,174
Ending Balance		26	624	26	624
Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(24,966)	(9,700)	(9,443)	(126)
Other comprehensive income (loss) before reclassifications		(535)	(3,049)	(18,594)	(12,759)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	2,318	197	4,854	333
Other comprehensive income (loss)		1,783	(2,852)	(13,740)	(12,426)
Ending Balance		(23,183)	(12,552)	(23,183)	(12,552)
Pension and Other Postretirement Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		788	4,177	889	5,031
Other comprehensive income (loss) before reclassifications		52	44	293	(468)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[3]	(171)	(171)	(513)	(513)
Other comprehensive income (loss)		(119)	(127)	(220)	(981)
Ending Balance		669	4,050	669	4,050
Investments in Convertible Preferred Securities Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		258	258	258	258
Other comprehensive income (loss) before reclassifications		0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0	0	0	0
Other comprehensive income (loss)		0	0	0	0
Ending Balance		$ 258	$ 258	$ 258	$ 258

[1] Reflects foreign currency translation adjustments in Other income, net attributable to the consolidation of Thompsons Limited in 2019.

[2] Amounts reclassified from gain (loss) on cash flow hedges are reclassified from AOCI to income when the hedged item affects earnings and is recognized in Interest expense, net. See Note 5 for additional information.

[3] This accumulated other comprehensive loss component is included in the computation of net periodic benefit cost recorded in Operating, administrative and general expenses.