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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest expense related to uncertain tax positions	$ 554	$ 1,853	$ 536
Interest on income taxes accrued	2,185	3,054
Lapsing of statutes of limitations	$ 3,186	$ 209	$ 328
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%	35.00%
Income tax expense/(benefit) from tax rate change	$ 110,765
Deferment of employer-paid social security taxes	70,812
CARES Act to QIP, acceleration of depreciation expenses	$ 60,376
Impact to tax rate	0.00%
CARES Act, employee retention credits	$ 3,403
TCJA cumulative tax adjustments			$ 6,446
Canada [Member]
CARES Act, employee retention credits	2,028
Foreign Tax Authority [Member]
Gross NOLS	98,710	$ 68,169
Valuation allowances of deferred tax assets	104,820	77,191
State and Local Jurisdiction [Member]
Gross NOLS	340,259	$ 0
Domestic Tax Authority [Member]
Lapsing of statutes of limitations	$ 6,316

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