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Long-Term Debt, Capital Lease Obligation (Details) (USD $)
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6 Months Ended |
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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| Debt Disclosure [Abstract] |
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| Senior Notes Noncurrent Variable Rate Term Note |
$ 42,500,000 |
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$ 45,000,000 |
| Senior Notes Noncurrent Variable Rate Revolving Note |
126,500,000 |
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128,700,000 |
| Total senior secured debt |
169,000,000 |
|
173,700,000 |
| Unsecured Debt |
2,623,000 |
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2,470,000 |
| Capital Lease Obligations |
459,000 |
|
221,000 |
| Long-term Debt, Current Maturities |
(7,831,000) |
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(7,667,000) |
| Long-term debt, less current portion |
164,251,000 |
|
168,724,000 |
| Line of Credit Facility [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
215,000,000 |
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| Line of Credit Facility, Amendment Fees, Amount |
300,000 |
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| Lineofcreditfacilityoriginalmaximumborrowingcapacity |
155,000,000 |
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| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
9,691,000 |
37,096,000 |
40,225,000 |
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Act [Member]
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| Line of Credit Facility [Line Items] |
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| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
1,400,000 |
24,644,000 |
24,563,000 |
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Secured Debt [Member]
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| Line of Credit Facility [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
50,000,000 |
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| Line of Credit Facility, Expiration Date |
December 6, 2015 |
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Revolving Credit Facility [Member]
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| Line of Credit Facility [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
165,000,000 |
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| Line of Credit Facility, Expiration Date |
December 6, 2015 |
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| Line Of Credit Facility Maximum Borrowing Capacity Accordion Feature |
$ 200,000,000 |
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