Debt - Senior Secured Revolving Credit Facility - Narrative (Details)		3 Months Ended
	Feb. 22, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Financing costs write-offs		$ 3,755,000	$ 0
Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility	$ 265,000,000
Line of credit, current borrowing capacity	$ 175,000,000
Proportion of value of inventory and real property (as a percent)	65.00%
Proportion of commitment reduction along with prepayment with net cash proceeds of asset sales (as a percent)	50.00%
Debt issuance costs	$ 4,900,000
Unamortized debt issuance fees	200,000
Financing costs write-offs	3,300,000
Carrying value of debt		17,800,000
Average daily balance of borrowings outstanding		1,900,000
Credit Facility | Letter of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility	25,000,000
Carrying value of debt		$ 0
Credit Facility | Swing Line Loan | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility	$ 10,000,000
Minimum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Fixed charge coverage ratio	1.05
Minimum | Credit Facility | Letter of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Liquidity determinant, unrestricted cash on hand	$ 25,000,000
Maximum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit, current borrowing capacity	$ 100,000,000
Base Rate | Minimum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.25%
Base Rate | Maximum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	1.75%
Eurodollar | Minimum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.25%
Eurodollar | Maximum | Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)	2.75%