Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($)			6 Months Ended
	Mar. 31, 2016	May 10, 2013	Jun. 30, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Amount borrowed			$ 64,912,000	$ 50,546,000
Term loan [Member]
Line of Credit Facility [Line Items]
Amount borrowed			21,827,000	$ 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		5,000,000
Credit facility, availability			61,000,000
Credit facility, available borrowing capacity, net of outstanding borrowings			$ 12,900,000
Credit facility, commitment fee percentage (percent)			0.25%
Credit facility, amount outstanding			$ 43,100,000
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			$ 100,000
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			$ 43,000,000
Credit facility, interest rate at period end (percent)			2.96%
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			21,800,000
Credit Facility | Term loan [Member] | PNC Bank Base Rate [Member]
Line of Credit Facility [Line Items]
Amount borrowed			$ 800,000
Debt, interest rate at period end			5.75%
Credit Facility | Term loan [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Amount borrowed			$ 21,000,000
Debt, interest rate at period end			3.71%
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%