Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($)		3 Months Ended
	May. 10, 2013	Mar. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Amount borrowed		$ 61,235,000	$ 50,546,000
Term loan [Member]
Line of Credit Facility [Line Items]
Amount borrowed		23,613,000	$ 25,398,000
Credit Facility
Line of Credit Facility [Line Items]
Limit on capital expenditures		25,000,000
Annual limit on capital expenditures		$ 32,000,000
Increase in interest rate (percent)		1.00%
Covenant, percent of adjusted EBITDA which must be prepaid (percent)	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 (in days)	60 days
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000.0	$ 75,000,000.0
Minimum average undrawn availability during period		10,000,000
Undrawn availability required		5,000,000
Credit facility, availability		60,000,000
Credit facility, available borrowing capacity, net of outstanding borrowings		$ 17,400,000
Credit facility, commitment fee percentage (percent)		0.25%
Credit facility, amount outstanding		$ 37,600,000
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Base lending rate (percent)		3.50%
Credit facility, amount outstanding		$ 7,600,000
Credit facility, interest rate at period end (percent)		5.00%
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility, amount outstanding		$ 30,000,000
Credit facility, interest rate at period end (percent)		2.94%
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		1.50%
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		2.50%
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		2.00%
Credit Facility | Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		3.00%
Credit Facility | Letter of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 10,000,000
Credit Facility | Term loan [Member]
Line of Credit Facility [Line Items]
Debt, face amount	50,000,000.0
Monthly principal payments	$ 600,000
Amount borrowed		23,600,000
Credit Facility | Term loan [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Amount borrowed		$ 600,000
Debt, interest rate at period end		5.75%
Credit Facility | Term loan [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Amount borrowed		$ 23,000,000
Debt, interest rate at period end		3.69%
Credit Facility | Term loan [Member] | Minimum [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		2.25%
Credit Facility | Term loan [Member] | Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		3.25%
Credit Facility | Term loan [Member] | Maximum [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		2.75%
Credit Facility | Term loan [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread (percent)		3.75%