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Debt Debt (Senior Unsecured Notes) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 23, 2015 | May 21, 2015 | May 15, 2014 | Feb. 08, 2013 | Feb. 01, 2012 | Nov. 30, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal | $ 750,000,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 1,813,169,000 | $ 1,807,054,000 |  |  |  |  |  |  |
Note tender offer |  |  | 300,100,000 |  |  |  |  |  |  |
Redemption premium |  |  | 49,900,000 |  |  |  |  |  |  |
Loss on extinguishment of debt |  | 0 | (19,225,000) | $ 0 |  |  |  |  |  |
Proceeds from issuance of debt, net of discount | $ 728,600,000 |  |  |  |  |  |  |  |  |
7.875% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 250,000,000
Debt instrument, stated rate |  |  |  |  |  |  |  |  | 7.875% | 7.875%
Debt instrument percentage, of fair value |  |  |  |  |  |  |  |  |  | 101.00%
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  |  |  | $ 350,000,000 |
Debt Instrument, effective interest rate |  |  |  |  |  |  |  |  | 7.682% |
6.00% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | 400,000,000 | 400,000,000 |  |  | $ 400,000,000 |  |  |  |
Debt instrument, stated rate |  |  |  |  |  | 6.00% |  |  |  |
Senior unsecured notes |  | $ 393,242,000 | 392,175,000 |  |  |  |  |  |  |
Redemption premium for notes |  | 106.00% |  |  |  |  |  |  |  |
5.750% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | $ 350,000,000 | 350,000,000 |  |  |  |  | $ 350,000,000 |  |
Debt instrument, stated rate |  |  |  |  |  |  |  | 5.75% |  |
Senior unsecured notes |  | 345,837,000 | 344,817,000 |  |  |  |  |  |  |
6.750% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | 750,000,000 | 750,000,000 |  | $ 750,000,000 |  |  |  |  |
Debt instrument, stated rate |  |  |  |  | 6.75% |  |  |  |  |
Senior unsecured notes |  | $ 730,704,000 | 727,572,000 |  |  |  |  |  |  |
Redemption premium for notes |  | 106.75% |  |  |  |  |  |  |  |
5.625% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | $ 350,000,000 | 350,000,000 |  |  |  | $ 350,000,000 |  |  |
Debt instrument, stated rate |  |  |  |  |  |  | 5.625% |  |  |
Senior unsecured notes |  | $ 343,386,000 | $ 342,490,000 |  |  |  |  |  |  |
Redemption premium for notes |  | 105.625% |  |  |  |  |  |  |  |
Early debt redemption, maximum percentage of principal |  |  | 35.00% |  |  |  |  |  |  |

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