Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate		24.90%	16.20%	35.00%
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability	$ (70,400)		$ (70,400)
Federal statutory income tax rate		21.00%	35.00%	35.00%
Increase (decrease) in other deferred liability		$ 30,500
Net operating loss carryforwards	48,722	74,213	$ 48,722
Operating Loss Carryforwards [Line Items]
Valuation allowance, amount	47,955	56,925	47,955
Unrecognized tax benefits	0	0	0
State Tax Net Operating Losses
Operating Loss Carryforwards [Line Items]
Valuation allowance, amount	$ 46,400	$ 49,100	$ 46,400
Percent of deferred tax asset for which valuation allowance has been recognized	100.00%	100.00%	100.00%
Foreign Tax Net Operating Losses
Operating Loss Carryforwards [Line Items]
Valuation allowance, amount	$ 1,600	$ 7,800	$ 1,600
Percent of deferred tax asset for which valuation allowance has been recognized	68.00%	31.00%	68.00%