Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Tax credit carryforwards	$ 5,326	$ 7,879
Pension, compensation, and other employee benefits	11,991	17,231
Provisions for losses	4,623	4,778
Net operating loss carryforwards	44,358	5,371
State income taxes		3,089
Leases	660
Goodwill and other intangible assets	18,055
Other deferred income tax assets	14,175	2,177
Total deferred tax assets	99,188	40,525
Valuation allowance	(81,795)	(4,276)
Foreign deferred tax assets included above	(7,717)	(2,351)
United States net deferred tax assets	9,676	33,898
Deferred tax liabilities:
Property and equipment	(24,017)	(20,681)
Goodwill and other intangible assets	(8,846)	(16,172)
Leases	(857)
Life insurance		(3,945)
Other deferred income tax liabilities	(4,485)	(1,858)
Total deferred tax liabilities	(38,205)	(42,656)
Foreign deferred tax liabilities included above	28,490	31,192
United States net deferred tax assets (liabilities)	$ (39)
United States net deferred tax assets		$ 22,434