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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Interest Rate Swap [Member] | Dec. 31, 2010 Interest Rate Swap [Member] | Dec. 31, 2011 Cash Flow Hedging [Member] | Dec. 31, 2010 Cash Flow Hedging [Member]
Derivative Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Fair value of the interest rate swap, with adjustment for credit risk |  |  |  | $ 629 | $ 686 |  |
Effective portion of the loss on the derivatives included as a component of other comprehensive income, net of taxes | 92 | 92 |  |  |  | 10 | 551
Notional amount of interest rate swap | 10,627 | 10,627 |  | 10,627 |  |  |
Percentage of fixed interest on the amortizing notional amount of interest rate swap |  |  |  | 3.245% |  |  |
Interest rate swap reflected in a restricted cash account | 555 | 555 |  | 555 | 760 |  |
Derivative Instruments (Additional Textual) [Abstract] |  |  |  |  |  |  |
Period of LIBOR interest rate |  | 30 days |  |  |  |  |
Upfront payment related to interest rate corridor |  | 164 |  |  |  |  |
Fair value of the corridor derivative asset at inception | 164 | 164 |  |  |  |  |
Fair value of interest rate corridor with adjustment for credit risk | $ 1 | $ 1 | $ 27 |  |  |  |
Maximum percentage of variable interest rates based on LIBOR |  | 4.00% |  |  |  |  |
Percentage of amount paid by University |  | 4.00% |  |  |  |  |
Maximum percentage of LIBOR | 4.00% | 4.00% |  |  |  |  |
Minimum percentage of LIBOR | 6.00% | 6.00% |  |  |  |  |
Percentage deducted from LIBOR for actual payment |  | 2.00% |  |  |  |  |

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