Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($)		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 29, 2017	May 10, 2013
Credit Facility
Line of Credit Facility [Line Items]
Covenant, percent of adjusted EBITDA which must be prepaid		25.00%
Credit facility ceiling value applicable to 25% of adjusting EBITDA which must be paid		$ 3,000,000.0
Covenant, maximum number of days from year end by which prepayment of 25% of adjusted EBITDA is due		60 days
Credit Facility | Debt Covenant, Period One
Line of Credit Facility [Line Items]
Limit on capital expenditures		$ 20,000,000
Credit Facility | Debt Covenant, Period Two
Line of Credit Facility [Line Items]
Limit on capital expenditures		26,000,000
Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 75,000,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility
Line of Credit Facility [Line Items]
Credit facility, availability		74,900,000
Credit facility, available borrowing capacity, net of outstanding borrowings		$ 34,300,000
Credit facility, commitment fee percentage		0.25%
Credit facility, amount outstanding		$ 40,600,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Base lending rate		4.25%
Credit facility, amount outstanding		$ 2,600,000
Credit facility, interest rate at period end		5.75%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | LIBOR
Line of Credit Facility [Line Items]
Credit facility, amount outstanding		$ 38,000,000
Credit facility, interest rate at period end		3.74%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum
Line of Credit Facility [Line Items]
Fixed coverage charge ratio requirement		1.00
Leverage ratio requirement		3.0
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread		1.50%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread		2.50%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum
Line of Credit Facility [Line Items]
Fixed coverage charge ratio requirement		1.10
Leverage ratio requirement		5.5
Undrawn availability required		$ 15,000,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread		2.00%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | LIBOR
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread		3.00%
Credit Facility | Term loan
Line of Credit Facility [Line Items]
Debt, face amount	$ 10,000,000
Monthly principal payments	$ 200,000
Credit Facility | Letter of Credit | Borrowings under revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 10,000,000
Tenth Amendment to the Credit Facility | Line of Credit | Borrowings under revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 75,000,000