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Debt - TPG Term Loan - Narrative (Details) - USD ($)				1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Feb. 06, 2017	Aug. 22, 2016	Jun. 28, 2016	Mar. 31, 2017	Feb. 28, 2017	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt issuance costs												$ 900,000	$ 17,200,000	$ 1,500,000	$ 200,000
Loss on debt extinguishment and modifications						$ 11,921,000	$ 0	$ 11,921,000	$ 0	$ 11,921,000	$ 25,000	11,921,000	357,000	$ 12,000	$ 0
Term Loan | TPG Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount			$ 60,000,000.0
Debt default, basis spread on interest rate	2.00%		2.00%
Maturity, period prior to senior notes maturity			90 days
Lender fees			$ 1,300,000										2,300,000
Deferred costs			$ 1,600,000
Amendment fee		$ 3,000,000		$ 6,100,000	$ 5,100,000								11,400,000
Debt issuance costs				400,000		$ 400,000						$ 400,000	$ 400,000
Interest rate, effective percentage			10.75%										10.84%
Accrued unpaid interest													$ 1,200,000
Loss on debt extinguishment and modifications				$ (11,900,000)
Term Loan | TPG Term Loan | September 30, 2017 to June 30, 2018
Debt Instrument [Line Items]
Periodic payment, principal			$ 375,000
Term Loan | TPG Term Loan | After June 30, 2018
Debt Instrument [Line Items]
Periodic payment, principal			$ 750,000
Term Loan | TPG Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			9.75%										9.75%
Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 135,000,000

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