Incentive Plan - Narrative (Details) - USD ($)		12 Months Ended
	Dec. 23, 2016	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	3,237,671
Number of shares available for grant (in shares)		1,326,156
Compensation expense related to share-based arrangements		$ 23,000,000	$ 10,100,000
Tax benefit from compensation expense		0	0
Unrecognized compensation cost		$ 39,700,000
Unrecognized compensation cost, period for recognition		1 year 10 months 21 days
Total fair value of share-based awards vested		$ 7,300,000	9,700,000
Excess tax expense benefit due to carryforward Loss		$ 0	$ 0
Number of shares exercisable by warrants (in shares)	2,066,627
Warrants outstanding (in shares)	2,066,627
Exercise price (in dollars per share)	$ 55.25
Warrants, fair value	$ 8,400,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period option is available to be exercised		10 years
Vesting period		3 years