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Debt (Senior Notes) (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Aug. 15, 2014 8.25% Senior Notes [Member] | Jul. 01, 2014 8.25% Senior Notes [Member] | Apr. 13, 2012 8.25% Senior Notes [Member] | Jul. 24, 2009 8.25% Senior Notes [Member] | Sep. 30, 2014 8.25% Senior Notes [Member] | Dec. 31, 2013 8.25% Senior Notes [Member] | Jul. 13, 2012 5.75% Senior Notes [Member] | Sep. 30, 2014 5.75% Senior Notes [Member] | Dec. 31, 2013 5.75% Senior Notes [Member] | Sep. 28, 2012 5.625% Senior Notes [Member] | Sep. 30, 2014 5.625% Senior Notes [Member] | Dec. 31, 2013 5.625% Senior Notes [Member] | Jul. 01, 2014 4.875% Senior Notes [Member] | Sep. 30, 2014 4.875% Senior Notes [Member] | Jul. 01, 2014 4.875% Senior Notes [Member] | Apr. 29, 2009 4.0% Convertible Senior Notes [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] | Dec. 31, 2013 4.0% Convertible Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  | $ 375,000,000 |  |  | $ 800,000,000 |  |  | $ 500,000,000 |  |  |  |  | $ 750,000,000 |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Aug. 15, 2019 | Aug. 15, 2019 |  | Jul. 15, 2020 | Jul. 15, 2020 |  | Oct. 01, 2019 | Oct. 01, 2019 |  | Jul. 15, 2022 | Jul. 15, 2022 |  | Oct. 01, 2014 | Oct. 01, 2014 |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  | 8.25% | 8.25% |  | 5.75% | 5.75% |  | 5.625% | 5.625% |  |  | 4.875% | 4.875% | 4.00% | 4.00% |
Percentage of face value price for issuance of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.178% |  |  |  |  |
Interest payable dates |  |  |  |  |  |  |  |  |  |  |  | July 15 and January 15 |  |  | April 1 and October 1 |  |  | January 15 and July 15 |  |  | April 1 and October 1 |  |
Amortized deferred financing fees | 4,599,000 | 3,981,000 | 13,114,000 | 11,508,000 |  | 3,300,000 | 11,400,000 | 2,400,000 |  |  |  | 14,000,000 |  |  | 8,600,000 |  |  |  |  |  |  |  |
Debt instrument, aggregate principal amount redeemed |  |  |  |  |  | 243,800,000 | 121,000,000 | 131,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on redemption |  |  |  |  |  | 10,100,000 | 253,000,000 | 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount expensed |  |  |  |  |  | 1,200,000 |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance | $ 7,559,568,000 |  | $ 7,559,568,000 |  | $ 5,910,041,000 |  |  |  |  |  | $ 243,750,000 |  | $ 800,000,000 | $ 800,000,000 |  | $ 500,000,000 | $ 500,000,000 |  | $ 750,000,000 |  |  | $ 367,068,000 | $ 499,944,000

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