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Debt - Wells Fargo Credit Agreement - Amendments (Details)									12 Months Ended
	Mar. 29, 2018 USD ($)	Jul. 17, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jan. 27, 2017	Jun. 28, 2016 USD ($)	Apr. 29, 2015 USD ($)	Apr. 01, 2014 USD ($)	Jun. 28, 2013 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 01, 2018 USD ($)	Oct. 03, 2017 USD ($)	Dec. 19, 2016 USD ($)	Aug. 22, 2016 USD ($)	Feb. 11, 2015 USD ($)	Sep. 30, 2014 USD ($)
Line of Credit Facility [Line Items]
Repayments of long-term debt									$ 71,400,000		$ 4,028,000	$ 972,000
Wells Fargo Credit Agreement
Line of Credit Facility [Line Items]
Lender fees			$ 700,000		$ 200,000										$ 100,000
Reserve against borrowing base availability															$ 12,500,000	$ 12,500,000
Reserve against borrowing base availability upon filing delinquent reports																$ 7,500,000
Wells Fargo Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Lender fees	$ 800,000
Wells Fargo Credit Agreement | Term Loan
Line of Credit Facility [Line Items]
Debt instrument, face amount						$ 3,500,000.0	$ 5,000,000.0
Debt instrument, term							36 months
Repayments of long-term debt						$ 5,000,000
Wells Fargo Credit Agreement | Term Loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate						4.50%	4.50%
Revolving Credit Facility | Wells Fargo Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 52,500,000.0	$ 65,000,000		$ 75,000,000		$ 90,000,000.0	$ 75,000,000.0						$ 58,750,000.00			$ 125,000,000.0	$ 100,000,000
Debt covenant, fixed charge coverage ratio, minimum							1.2	1.0
Debt covenant, debt leverage ratio, maximum							4.0
Lender fees									700,000	$ 300,000		$ 100,000
Commitment fee percentage		1.00%		1.00%	2.00%
Interest rate increase			2.00%
Line of credit facility, decrease limit			$ 25,000,000.0
Available revolving line of credit balance			$ 40,000,000						$ 13,000,000
Line of credit facility, increase limit		$ 12,500,000.0						$ 100,000,000.0
Decrease in interest rate margin		(1.00%)
Maturity, period prior to senior notes maturity									60 days
Revolving Credit Facility | Wells Fargo Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000
Commitment fee percentage	1.00%
Maturity, period prior to senior notes maturity	60 days
Percentage of borrowing base	10.00%
Revolving Credit Facility | Wells Fargo Credit Agreement | Subsequent Event | Forecast
Line of Credit Facility [Line Items]
Line of credit facility, increase limit													$ 9,000,000.0
Revolving Credit Facility | Wells Fargo Credit Agreement | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, increase limit														$ 6,250,000.00
Revolving Credit Facility | Wells Fargo Credit Agreement | Minimum | Subsequent Event
Line of Credit Facility [Line Items]
Line of credit facility, increase limit	$ 6,500,000.0
Revolving Credit Facility | Wells Fargo Credit Agreement | Maximum | Subsequent Event
Line of Credit Facility [Line Items]
Line of credit facility, increase limit	$ 7,500,000.0
Revolving Credit Facility | Wells Fargo Credit Agreement | LIBOR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.75%			1.50%
Revolving Credit Facility | Wells Fargo Credit Agreement | LIBOR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.25%			2.00%

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