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Derivative Instruments (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended |  |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Oct. 22, 2013 | Aug. 26, 2013 counterparties | Sep. 30, 2010 2015 Notes Hedges [Member] counterparties | Sep. 30, 2010 2015 Warrants [Member] counterparties | Sep. 30, 2013 2015 Warrants [Member] | Sep. 30, 2010 September 2015 Notes [Member] | Sep. 30, 2013 SunTrust [Member] Not Designated as Hedging Instrument [Member] | Sep. 30, 2013 SunTrust [Member] Three Month London Interbank Offered Rate (LIBOR) [Member] Not Designated as Hedging Instrument [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative collateral | $ 622,000,000 |  | $ 328,700,000 |  |  |  |  |  |  | $ 5,200,000 |
Credit risk, maximum exposure | 48,000,000 |  | 93,700,000 |  |  |  |  |  |  |  |
Derivative, cap interest rate |  |  |  |  |  |  |  |  |  |  | 2.50%
Interest rate swaps and caps, duration |  |  |  |  |  |  |  |  |  | 7 years |
Principal amount of convertible senior notes payable at issuance |  |  |  |  |  |  |  |  | 200,000,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  | 3.50% |  |
Number of counterparties |  |  |  |  |  | 2 | 2 |  |  |  |
Derivative, conversion spread, shares |  |  |  |  |  | 16.0 |  |  |  |  |
Derivative, asset, strike price |  |  |  |  |  | $ 12.50 |  |  |  |  |
Warrants, number of securities called by warrants |  |  |  |  |  |  | 16.0 | 16.2 |  |  |
Warrants, strike price |  |  |  |  |  |  | $ 16.00 | $ 15.81 |  |  |
Warrants, deliverable |  |  |  |  |  |  | 11.6 |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  | 15,600,000 |  |  |  |
Number of counterparties, partial unwind agreements |  |  |  |  | 2 |  |  |  |  |  |
Percentage of outstanding call options and warrants settled pursuant to agreement |  |  |  | 50.00% | 50.00% |  |  |  |  |  |
Warrants reclassified from equity to liability, at fair value | $ (41,878,000) | $ 0 |  |  |  |  |  |  |  |  |
Percentage of outstanding warrants reclassified from equity to derivative liabilities upon entering into unwind agreement |  |  |  |  | 50.00% |  |  |  |  |  |

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- Definition Amount of outstanding call options and warrants settled pursuant to agreement, percentage + References No definition available. + Details
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- Definition The price per share that we will be entitled to receive if we opt to exercise the call options of the 2015 notes hedge. + References No definition available. + Details
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- Definition Number of shares that is the basis for the amount of cash that we are entitled to if we exercise the call options in the 2015 notes hedge. + References No definition available. + Details
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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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