Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($)		3 Months Ended
	Sep. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Amount borrowed		$ 49,686,000	$ 48,399,000
Term loan
Line of Credit Facility [Line Items]
Amount borrowed		9,083,000	$ 9,833,000
Credit Facility
Line of Credit Facility [Line Items]
Limit on capital expenditures		$ 20,000,000
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 | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 65,000,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		55,000,000
Credit facility, availability		55,800,000
Credit facility, available borrowing capacity, net of outstanding borrowings		$ 15,200,000
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		4.00%
Credit facility, amount outstanding		$ 5,600,000
Credit facility, interest rate at period end		6.00%
Credit Facility | Line of Credit | Borrowings under revolving credit facility | LIBOR
Line of Credit Facility [Line Items]
Credit facility, amount outstanding		$ 35,000,000
Credit facility, interest rate at period end		3.78%
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		4.0
Undrawn availability required		$ 10,000,000
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	$ 10,000,000
Monthly principal payments	$ 200,000
Amount borrowed		9,100,000
Credit Facility | Term loan | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Amount borrowed		$ 1,100,000
Debt, interest rate at period end		6.75%
Credit Facility | Term loan | LIBOR
Line of Credit Facility [Line Items]
Amount borrowed		$ 8,000,000
Debt, interest rate at period end		4.53%
Credit Facility | Term loan | Minimum | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.25%
Credit Facility | Term loan | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	3.25%
Credit Facility | Term loan | Maximum | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.75%
Credit Facility | Term loan | Maximum | LIBOR
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	3.75%
Credit Facility | Letter of Credit | Borrowings under revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 10,000,000