Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ 1,195,655	$ 876,764	$ 822,899
Other comprehensive loss		(4,845)	(844)	(3,687)
Ending Balance		1,160,660	1,195,655	876,764
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(7,231)	(6,387)	(2,700)
Other comprehensive loss				(3,687)
Ending Balance		(12,076)	(7,231)	(6,387)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		1,065	(11,550)
Other comprehensive income (loss) before reclassifications		5,331	1,352
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0	11,666
Tax effect		(657)	(403)
Other comprehensive loss		4,674	12,615
Ending Balance		5,739	1,065	(11,550)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(9,443)	(126)
Other comprehensive income (loss) before reclassifications		(19,565)	(13,608)
Amounts reclassified from accumulated other comprehensive income (loss)	[2]	8,068	1,210
Tax effect		2,834	3,081
Other comprehensive loss		(8,663)	(9,317)
Ending Balance		(18,106)	(9,443)	(126)
Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		889	5,031
Other comprehensive income (loss) before reclassifications		(200)	(4,498)
Amounts reclassified from accumulated other comprehensive income (loss)	[3]	(911)	(911)
Tax effect		255	1,267
Other comprehensive loss		(856)	(4,142)
Ending Balance		33	889	5,031
Investments in Convertible Preferred Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		258	258
Other comprehensive loss		0	0
Ending Balance		$ 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.