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Long-Term Debt (Term Loans) (Details) (USD $) |  |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 SUSP Term Loan [Member] Term Loan [Member] | Sep. 25, 2012 SUSP Term Loan [Member] Term Loan [Member] | Sep. 25, 2012 SUSP Term Loan [Member] Federal Funds Rate [Member] Term Loan [Member] | Sep. 25, 2012 SUSP Term Loan [Member] LIBOR [Member] Term Loan [Member] | Sep. 25, 2012 SUSP Term Loan [Member] LIBOR plus Federal Funds Rate or LIBOR plus Prime Rate [Member] Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  | $ 180,700,000 | $ 180,700,000 |  |  |
Basis spread on variable rate |  |  |  |  | 0.50% | 1.00% | 0.25%
Interest rate at end of period |  |  | 0.43% |  |  |  |
Covenant collateral percentage amount |  |  | 98.00% |  |  |  |
Marketable securities | $ 37,936,000 | $ 148,264,000 |  |  |  |  |

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