Long-Term Debt and Notes Payable - Loss on Early Retirement of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Line of Credit Facility [Line Items]
Loss on early retirement of debt	$ 10,255	$ 19,719
Credit facility
Line of Credit Facility [Line Items]
Loss on early retirement of debt	10,300
Loss on early retirement of debt, write off deferred debt issuance cost	400
Loss on early retirement of debt, debt modification losses	$ 9,900