Principal Business Activity and Significant Accounting Policies - Adopted Accounting Standard Updates (“ASU”) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Condensed Consolidated Statements of Operations
Revenues	$ 115,066,000	$ 67,029,000
Cost of sales	99,183,000	54,829,000
General and administrative expenses	18,968,000	7,405,000
(Provision) benefit for income taxes	1,067,000	0
Net (loss) income	(3,957,000)	$ 4,279,000
Assets
Accounts Receivable	58,962,000		$ 21,759,000
Inventories	79,239,000		44,056,000
Other current assets	3,389,000		1,991,000
Liabilities and member's equity
Other accrued expenses	2,344,000		1,880,000
Accumulated deficit	(5,696,000)		$ (3,493,000)
ASU 2014-09 | Adjustments
Condensed Consolidated Statements of Operations
Revenues	866,000
Cost of sales	(14,000)
General and administrative expenses	99,000
(Provision) benefit for income taxes	125,000
Net (loss) income	656,000
Assets
Accounts Receivable	639,000
Inventories	(1,000,000)
Other current assets	557,000
Liabilities and member's equity
Other accrued expenses	(683,000)
Accumulated deficit	487,000
ASU 2014-09 | Balance Without Adoption of ASC 606
Condensed Consolidated Statements of Operations
Revenues	115,932,000
Cost of sales	99,169,000
General and administrative expenses	19,067,000
(Provision) benefit for income taxes	1,192,000
Net (loss) income	(3,301,000)
Assets
Accounts Receivable	59,601,000
Inventories	78,239,000
Other current assets	3,946,000
Liabilities and member's equity
Other accrued expenses	1,661,000
Accumulated deficit	$ (5,209,000)