Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	May 01, 2010	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards
U.S. federal income tax rate (as a percent)		21.00%	21.00%	21.00%
Reduction in net operating loss as a result of emergence from Chapter 11	$ 804,800
Estimated annual limitation		$ 32,500
Foreign tax credits		21,367	$ 20,469
Valuation allowance		128,159	130,641
Foreign tax credits valuation allowance		18,000
Unrecognized tax benefit		25,400	$ 25,700
U.S. Federal
Operating Loss Carryforwards
Net operating loss carryforwards		600,000
State
Operating Loss Carryforwards
Net operating loss carryforwards		$ 6,300,000
Minimum
Operating Loss Carryforwards
Property, plant and equipment, useful life		20 years
Property, plant and equipment, useful life, tax		1 year
Maximum
Operating Loss Carryforwards
Property, plant and equipment, useful life		25 years