Income Taxes - Schedule Of Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax liabilities:
Depreciation	$ 149,974	$ 135,824
Debt discount on 2022 Notes, 2023 Notes and 2032 Notes	5,902	7,727
Prepaid and other	1,309	437
Total deferred tax liabilities	157,185	143,988
Deferred tax assets:
Net operating losses	(47,916)	(33,480)
Reserves, accrued liabilities and other	(21,347)	(19,496)
Total deferred tax assets	(69,263)	(52,976)
Valuation allowance	17,940	12,337
Net deferred tax liabilities	$ 105,862	$ 103,349