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Long-Term Debt (Senior Notes) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member] | Sep. 29, 2012 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2012 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2011 6.125% Notes, Payable January 15, 2016 [Member] | Apr. 16, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2011 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2002 7.20% Senior Notes, Payable April 15, 2012 [Member] | Sep. 29, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2012 Subsequent Event [Member] 3.850% Senior Notes Due, Payable January 15, 2016 [Member] | Jan. 31, 2013 Subsequent Event [Member] 3.850% Senior Notes Due, Payable January 15, 2016 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) on Interest Rate | 0.05% |  |  | (0.75%) |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts |  |  |  |  | $ 900,000,000 |  |  |  |  |  |  | $ 400,000,000 |  |  | $ 600,000,000
Interest rate percentage |  |  |  |  | 6.125% |  | 6.125% | 6.125% |  | 7.20% | 7.20% | 7.20% | 7.20% |  | 3.85%
Redemption rate to the aggregate principal of notes outstanding and accrued and unpaid interest, percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |
Notes payable, maturity date |  |  |  |  | Jan. 15, 2016 |  | Jan. 15, 2016 | Jan. 15, 2016 |  | Apr. 15, 2012 | Apr. 15, 2012 | Apr. 15, 2012 |  |  |
Increase in interest rate from rating agency downgrade |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |
Maximum increase in interest rate per agency from rating agency downgrade |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes | 74,713,000 | 101,617,000 | 133,151,000 |  |  | 100,000 |  |  |  |  |  |  |  |  |
Incremental increase in outstanding notes |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Remaining outstanding senior notes repaid |  |  |  |  |  |  |  |  |  |  | 63,730,000 |  |  |  |
Repurchase price as percentage of principal amount of senior notes |  |  |  |  |  |  |  |  |  | 102.72% |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  |  |  | 336,270,000 |  |  |  |  |  |
Increase accrued interest |  |  |  |  |  |  |  |  | $ 12,106,000 |  |  |  |  |  |

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