Long-Term Debt and Credit Facility - Additional Disclosures (Details)			9 Months Ended
	Sep. 30, 2016 USD ($)	May 10, 2013 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Amount borrowed	$ 42,562,000		$ 42,562,000	$ 50,546,000
Term loan
Line of Credit Facility [Line Items]
Amount borrowed	10,000,000		10,000,000	$ 25,398,000
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
Debt instrument, term	2 years
Credit Facility | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 55,000,000	55,000,000	55,000,000
Undrawn availability required	15,000,000
Credit facility, availability	54,900,000		54,900,000
Credit facility, available borrowing capacity, net of outstanding borrowings	22,300,000		$ 22,300,000
Credit facility, commitment fee percentage			0.25%
Credit facility, amount outstanding	$ 32,600,000		$ 32,600,000
Credit Facility | Line of Credit | Revolving Credit Facility | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Base lending rate	3.50%		3.50%
Credit facility, amount outstanding	$ 2,600,000		$ 2,600,000
Credit facility, interest rate at period end	5.50%		5.50%
Credit Facility | Line of Credit | Revolving Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Credit facility, amount outstanding	$ 30,000,000		$ 30,000,000
Credit facility, interest rate at period end	3.78%		3.78%
Credit Facility | Line of Credit | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Fixed coverage charge ratio requirement	1.00
Leverage ratio requirement	4.0
Credit Facility | Line of Credit | 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 | Revolving Credit Facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread			2.50%
Credit Facility | Line of Credit | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Fixed coverage charge ratio requirement	1.10
Leverage ratio requirement	5.5
Credit Facility | Line of Credit | 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 | 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	10,000,000		10,000,000
Credit Facility | Term loan | PNC Bank Base Rate
Line of Credit Facility [Line Items]
Amount borrowed	$ 1,000,000		$ 1,000,000
Debt, interest rate at period end	6.25%		6.25%
Credit Facility | Term loan | LIBOR
Line of Credit Facility [Line Items]
Amount borrowed	$ 9,000,000		$ 9,000,000
Debt, interest rate at period end	4.28%		4.28%
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 | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 10,000,000