Long-Term Debt (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2011 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 |
Interest Rate Swap [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] | Line of Credit [Member] |
| Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member] |
| | | | Interest Rate Swap [Member] | Interest Rate Swap [Member] | Minimum [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] | | Maximum [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option One [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] | Debt Instrument, Interest Rate Option Two [Member] |
| | | | item | item | Interest Rate Swap [Member] | | Prime Rate [Member] | Federal Funds Rate [Member] | Federal Funds Rate [Member] | One Month Adjusted London Interbank Offered Rate [Member] | Fixed Rate [Member] | | Fixed Rate [Member] | | | | London Interbank Offered Rate [Member] | | Prime Rate [Member] | Federal Funds Rate [Member] | Federal Funds Rate [Member] | One Month Adjusted London Interbank Offered Rate [Member] | One Month Adjusted London Interbank Offered Rate [Member] |
Long-term debt | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Total long-term debt | ' | ' | ' | $110,508,000 | $110,994,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Less current maturities | 971,000 | 971,000 | ' | 971,000 | 971,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Long-term debt, less current maturities | 109,537,000 | 110,023,000 | ' | 109,537,000 | 110,023,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Unamortized discount on issuance of debt | ' | ' | ' | 677,000 | 766,000 | 1,250,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Long-term debt, additional disclosure | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Borrowings under senior credit facility | ' | ' | ' | 125,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 80,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Additional fixed interest rate spread (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 3.25% | ' | ' | ' | ' | ' | 4.25% | ' | ' | ' | 1.75% | ' | 1.25% | ' | ' | ' | ' | ' |
Variable rate basis | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 'Prime Rate | ' | 'Federal funds | 'London Interbank Offered Rate for a one month interest period | ' | ' | ' | ' | ' | ' | 'London Interbank Offered Rate | ' | 'Prime Rate | ' | 'Federal funds | ' | 'London Interbank Offered Rate |
Interest rate added to variable rate (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.50% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.50% | ' | 1.00% | ' |
Additional interest margin added to fixed and variable rates (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 1.00% | ' | 1.50% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Fixed interest rate base (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 1.50% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Remaining borrowing availability | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 62,405,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Annual acquisitions allowed | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 10,000,000 | ' | ' | ' | ' | ' | ' | ' | ' |
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained. | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 1 | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments | ' | ' | ' | 100.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow | ' | ' | ' | '150 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Percentage of excess cash flow paid as additional principal prepayments | ' | ' | ' | 50.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one | ' | ' | ' | 25.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, two | ' | ' | ' | 0.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Length of time after closing date for entering into a hedge | ' | ' | ' | ' | ' | ' | '90 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Percentage of aggregate outstanding principal amount of debt hedged | ' | ' | ' | ' | ' | ' | ' | ' | 25.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Notional amount | ' | ' | 50,000,000 | ' | ' | ' | 50,000,000 | 50,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Negative fair value included in other long-term liabilities | ' | ' | ' | ' | ' | ' | 138,000 | 138,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of financial institutions for which the entity is exposed to counterparty credit risk | ' | ' | ' | ' | ' | ' | 1 | 1 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Fixed interest rate on derivative (as a percent) | ' | ' | 6.34% | ' | ' | ' | 6.34% | 6.34% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Variable rate basis | ' | ' | 'LIBOR | ' | ' | ' | ' | 'LIBOR | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Interest rate added to variable rate (as a percent) | ' | ' | 4.25% | ' | ' | ' | 4.25% | 4.25% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
LIBOR floor (as a percent) | ' | ' | 1.50% | ' | ' | ' | 1.50% | 1.50% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding borrowings | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' |