Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	May 01, 2010	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards
U.S. federal income tax rate (as a percent)		21.00%	21.00%	35.00%
Reduction in net operating loss as a result of emergence from Chapter 11	$ 804,800
Estimated annual limitation		$ 32,500
Foreign tax credits		20,469	$ 39,300
Valuation allowance		130,641	115,172
Foreign tax credits valuation allowance		17,100
Unrecognized tax benefit		25,700	$ 25,700
U.S. Federal
Operating Loss Carryforwards
Net operating loss carryforwards		200,000
State
Operating Loss Carryforwards
Net operating loss carryforwards		$ 5,800,000
Minimum
Operating Loss Carryforwards
Property, plant and equipment, useful life		20 years
Property, plant and equipment, useful life, tax		7 years
Maximum
Operating Loss Carryforwards
Property, plant and equipment, useful life		25 years
Property, plant and equipment, useful life, tax		12 years