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Debt, Fixed Rate Debt (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Long term debt |  |
Debt issuance cost | $ 16,300,000 |
Obligation on capital leases | 4,756,000 | 4,336,000
Total long-term debt | 878,950,000 | 880,447,000
Less: Current portion of long-term debt | 92,000 | 127,000
Total long-term debt excluding current portion | 878,858,000 | 880,320,000
6.95% Senior Notes |  |
Long term debt |  |
Interest rate on debt | 6.95% |
Date of debt issuance | May 09, 2011 |
Maturity date of debt issued | May 15, 2060 |
Call date of debt issued | May 15, 2016 |
Long term debt | 342,000,000 | 342,000,000
6.7% Senior Notes |  |
Long term debt |  |
Interest rate on debt | 6.70% |
Maturity date of debt issued | Dec. 15, 2033 |
Call date of debt issued | Dec. 31, 2003 |
Long term debt, face value | 544,000,000 | 544,000,000
Unamortized discount | (11,806,000) | (9,889,000)
Long term debt | $ 532,194,000 | $ 534,111,000
6.7% Senior Notes | Minimum |  |
Long term debt |  |
Date of debt issuance | Dec. 15, 2003 |
6.7% Senior Notes | Maximum |  |
Long term debt |  |
Date of debt issuance | Jun. 15, 2004 |

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