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Total Debt (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Revolving Credit Facility [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] | Nov. 02, 2010 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Oct. 31, 2010 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Debt Covenant, Net Worth, Sum [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum | Dec. 31, 2012 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum | Dec. 31, 2012 Line of Credit [Member] | Dec. 31, 2011 Line of Credit [Member] | Dec. 31, 2011 Convertible Notes Payable [Member] | Dec. 31, 2010 Convertible Notes Payable [Member] | Dec. 31, 2004 Convertible Notes Payable [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | $ 0 | $ 127,563,000 |  | $ 0 | $ 125,000,000 |  |  |  |  |  |  |  | $ 0 | $ 2,563,000 |  |  |
Current maturities of long-term debt | 209,728,000 | 0 |  | 205,000,000 | 0 |  |  |  |  |  |  |  | 4,728,000 | 0 |  |  |
Total debt | 209,728,000 | 127,563,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 375,000,000 |  | 275,000,000 |  |  |  |  |  |  |  | 16,700,000
Loan origination fees | (67,000) | (155,000) | (421,000) |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Amendment, decrease in pricing schedule |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |
Amendment, decrease in commitment fee |  |  |  |  |  |  |  |  | 0.05% |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  |  | 1.625% | 3.125% |  |  |  |  |
Commitment fee, unused capacity |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.45% |  |  |  |  |
Effective interest rate during period |  |  |  |  |  |  | 1.87% | 2.19% |  |  |  |  |  |  |  |  |
Debt covenant, interest coverage ratio |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |
Debt covenant, leverage ratio |  |  |  |  |  |  |  |  |  |  | 3.25 |  |  |  |  |  |
Debt covenant, minimum net worth, base |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |
Debt covenant, minimum net worth, percent of net income |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Debt covenant, minimum net worth, percent of net proceeds from future debt or equity offerings |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  | 159,000,000 |  |  |  |  |  |  |  |  |  |
Shares acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452,603
Issuance of common stock for convertible note payable, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452,603 |  |
Gain on conversion of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |
Interest Expense | 4,531,000 | 8,924,000 | 6,179,000 |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |
Gain on long put option and short call option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |

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