Long-Term Debt and Credit Facility - Credit Facility (Details) (USD $)	9 Months Ended	12 Months Ended	9 Months Ended					0 Months Ended	9 Months Ended						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Line of Credit [Member]	Sep. 30, 2014 Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Sep. 30, 2014 Letter of Credit [Member] Revolving Credit Facility [Member]	Mar. 03, 2014 Term loan [Member]	Sep. 30, 2014 Term loan [Member]	Dec. 31, 2013 Term loan [Member]	Sep. 30, 2014 PNC Bank Base Rate [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 PNC Bank Base Rate [Member] Term loan [Member]	Sep. 30, 2014 London Interbank Lending Rate (LIBOR) [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 London Interbank Lending Rate (LIBOR) [Member] Term loan [Member]	Sep. 30, 2014 Minimum [Member] PNC Bank Base Rate [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Minimum [Member] PNC Bank Base Rate [Member] Term loan [Member]	Sep. 30, 2014 Minimum [Member] London Interbank Lending Rate (LIBOR) [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Minimum [Member] London Interbank Lending Rate (LIBOR) [Member] Term loan [Member]	Sep. 30, 2014 Maximum [Member] PNC Bank Base Rate [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Maximum [Member] PNC Bank Base Rate [Member] Term loan [Member]	Sep. 30, 2014 Maximum [Member] London Interbank Lending Rate (LIBOR) [Member] Line of Credit [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Maximum [Member] London Interbank Lending Rate (LIBOR) [Member] Term loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 75,000,000.0			$ 10,000,000
Debt, face amount									50,000,000.0
Credit facility, financial covenant, EBITDA to debt ratio, upper range	1.10
Credit facility, financial covenant, funded debt to adjusted EBITDA ratio	4.0
Annual limit on capital expenditures			36,000,000
Covenant, Percent of Adjusted EBITDA Which Must Be Prepaid	25.00%
Credit Facility Ceiling Value, Applicable to 25% Of Adjusted EBITDA Which Must Be Paid	3,000,000
Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due	60 days
Excess Cash Flow Minimum Achieved Under Loan Covenant		3,000,000
Amount paid on term loan due to covenant requirement								3,000,000
Credit facility, variable percentage rate spread															0.50%	1.25%	1.50%	2.25%	1.00%	1.75%	2.00%	2.75%
Base lending rate											3.25%
Credit facility, commitment fee percentage				0.25%
Credit facility, amount outstanding											200,000		4,000,000
Credit facility, interest rate at period end											3.75%		1.66%
Debt, interest rate at period end												4.50%		2.41%
Credit facility, availability				74,800,000
Credit facility, available borrowing capacity, net of outstanding borrowings				70,600,000
Amount borrowed	41,551,000	62,105,000			4,224,000	16,272,000			37,327,000	45,833,000		300,000		37,000,000
Monthly principal payments									$ 600,000