Stockholders' Equity - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands		4 Months Ended	12 Months Ended
	Aug. 31, 2017	Dec. 31, 2017	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Reorganization shares issued to debt holders (in shares)	2,000
Adjustment to additional paid in capital remeasurement of conversion feature			$ 60,760
Reclassification of debt to equity, tax effect		$ 17,044
Conversion of convertible notes		43,716
Additional Paid-in Capital
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of debt to equity, tax effect		17,044
Conversion of convertible notes		$ 43,716