Debt (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Mar. 14, 2018	Dec. 15, 2017	Jul. 21, 2017
Line of Credit Facility [Line Items]
Revolving Credit Facility, Capacity Available for Letter of Credit		$ 30,000		$ 30,000
Outstanding letters of credit		16,400		16,400
Total availability under revolving credit facility		21,600		21,600
Proceeds from Issuance or Sale of Equity	$ 52,500
Loss from debt extinguishment		0	$ 9,827	0	$ 9,827
Capital lease obligations		$ 18,800		$ 18,800		$ 9,600
London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Base Rate
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Minimum
Line of Credit Facility [Line Items]
Capital Leases and Purchase Money Indebtedness							$ 35,000
Maximum
Line of Credit Facility [Line Items]
Capital Leases and Purchase Money Indebtedness							$ 60,000
ABL Facility | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.50%
ABL Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.50%
ABL Facility | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.25%
ABL Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.25%
ABL Facility | Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 15,000	$ 200,000
ABL Facility | Bridge Loan
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									20,000
ABL Facility | Letter of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									30,000
ABL Facility | Term Loan Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									56,800
ABL Facility | Asset-Based Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 35,000