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Debt - Wells Fargo Credit Agreement - Narrative (Details)	Jun. 28, 2016 USD ($)	Apr. 29, 2015 USD ($)	Apr. 01, 2014 USD ($)	Jun. 28, 2013 USD ($)	Dec. 31, 2017 USD ($)	Oct. 03, 2017 USD ($)	Jul. 17, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 19, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 11, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)
Line of Credit Facility [Line Items]
Debt issuance costs					$ 900,000				$ 17,200,000		$ 1,500,000		$ 200,000
Wells Fargo Credit Agreement
Line of Credit Facility [Line Items]
Lender fees	$ 200,000							$ 700,000		$ 100,000
Wells Fargo Credit Agreement | Term Loan
Line of Credit Facility [Line Items]
Interest rate, effective percentage		4.67%
Debt instrument, face amount		$ 3,500,000.0	$ 5,000,000.0
Wells Fargo Credit Agreement | LIBOR | Term Loan
Line of Credit Facility [Line Items]
Basis spread on variable rate		4.50%	4.50%
Wells Fargo Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000		$ 90,000,000.0	$ 75,000,000.0		$ 58,750,000.00	$ 52,500,000.0	$ 65,000,000				$ 125,000,000.0		$ 100,000,000
Line of credit facility, increase limit				$ 100,000,000.0			$ 12,500,000.0
Unused line fee percentage				0.25%
Debt covenant, fixed charge coverage ratio, minimum			1.2	1.0
Debt covenant, threshold to report fixed charge coverage ratio, availability amount				$ 9,375,000.000
Debt covenant, threshold to report fixed charge coverage ratio, percentage of maximum borrowing capacity				12.50%
Debt issuance costs					100,000				100,000
Lender fees					$ 700,000				$ 300,000				$ 100,000
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, increase limit						$ 6,250,000.00
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum | Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate				0.00%
Wells Fargo Credit Agreement | Revolving Credit Facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%			1.50%
Wells Fargo Credit Agreement | Revolving Credit Facility | Maximum | Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate				0.50%
Wells Fargo Credit Agreement | Revolving Credit Facility | Maximum | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.25%			2.00%

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