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Investments and Fair Value Measurements (Details) (USD $) | 12 Months Ended | 59 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 days | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Feb. 14, 2008
Schedule of Available-for-sale Securities |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | $ 1,797,000 | $ 0 | $ 2,245,000 |  |
Amortized Cost and Fair Value of Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 198,500,000
Fair Value | 20,000,000 | 50,600,000 |  | 20,000,000 |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 25,000 |  |  | 25,000 |
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis | 25,000 |  |  | 25,000 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 |  |  | 0 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 0 |  |  | 0 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 0 |  |  | 0 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 0 |  |  | 0 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 19,991,000 |  |  | 19,991,000 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 21,275,000 |  |  | 21,275,000 |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair value, beginning of period | 50,569,000 | 88,694,000 |  |  |
Settlements | (32,350,000) | (38,125,000) |  |  |
Purchases | 0 | 0 |  |  |
Issuances | 0 | 0 |  |  |
Sales | 0 | 0 |  |  |
Transfers in to (out of) Level 3 | 0 | 0 |  |  |
Total gains or losses (realized/unrealized) included in earnings | 0 | 0 |  |  |
Total gains or losses (realized/unrealized) included in other comprehensive income, net of tax | 1,797,000 | 0 |  |  |
Fair value, end of period | 20,016,000 | 50,569,000 | 88,694,000 | 20,016,000 |
Auction Rate Securities, Debt, Rate Setting Interval (in days) | 35 |  |  |  |
Percent of portfolio with AAA credit rating | 41.00% | 100.00% |  | 41.00% |
Maturity and calls of investments | (32,350,000) | (38,125,000) |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (1,300,000) |  |  | (1,300,000) |
Basis of Tested Impact on Securities | 0.50% |  |  | 0.50% |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | 0 | 0 | 0 |  |
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities | 32,400,000 |  |  | 177,200,000 |
Auction rate security investments percentage of total assets | 4.30% |  |  | 4.30% |
Minimum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment Inputs Average Life of Underlying Loans | 2 | 2 |  | 2 |
Investment Inputs Rate of Return | 0.42% | 0.68% |  | 0.42% |
Investment Inputs Discount Rate | 0.25% | 0.48% |  | 0.25% |
Investment Inputs Liquidity Discount Rate | 0.17% | 0.55% |  | 0.17% |
Maximum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment Inputs Average Life of Underlying Loans | 12 | 12 |  | 12 |
Investment Inputs Rate of Return | 2.11% | 2.92% |  | 2.11% |
Investment Inputs Discount Rate | 0.84% | 1.14% |  | 0.84% |
Investment Inputs Liquidity Discount Rate | 0.61% | 1.16% |  | 0.61% |
Available-for-sale Securities [Member] |  |  |  |  |
Amortized Cost and Fair Value of Investments |  |  |  |  |
Amortized Cost | 21,300,000 |  |  | 21,300,000 |
Fair Value | 20,016,000 |  |  | 20,016,000 |
Auction rate student loan educational bonds long-term |  |  |  |  |
Amortized Cost and Fair Value of Investments |  |  |  |  |
Amortized Cost | 21,300,000 | 53,650,000 |  | 21,300,000 |
Gross Unrealized Gains | 0 | 0 |  | 0 |
Gross Unrealized Losses | 1,284,000 | 3,081,000 |  | 1,284,000 |
Fair Value | $ 20,016,000 | $ 50,569,000 |  | $ 20,016,000 |

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