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Derivative Instruments (Narrative) (Details) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 partial_unwind_agreement counterparties | Dec. 31, 2012 | Dec. 31, 2013 2015 Notes Hedges [Member] | Sep. 30, 2010 2015 Notes Hedges [Member] counterparties | Sep. 30, 2010 2015 Warrants [Member] counterparties | Dec. 31, 2013 2015 Warrants [Member] | Dec. 31, 2013 September 2015 Notes [Member] | Sep. 30, 2010 September 2015 Notes [Member] | Dec. 31, 2013 SunTrust [Member] Not Designated as Hedging Instrument [Member] | Dec. 31, 2013 SunTrust [Member] Three Month London Interbank Offered Rate (LIBOR) [Member] Not Designated as Hedging Instrument [Member] | Dec. 31, 2013 Call Options [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Credit risk, maximum exposure | $ 71,700,000 | $ 93,700,000 |  |  |  |  |  |  |  |  |
Number of partial unwind agreements | 3 |  |  |  |  |  |  |  |  |  |
Number of counterparties, partial unwind agreements | 2 |  |  |  |  |  |  |  |  |  |
Percentage of outstanding call options and warrants settled pursuant to partial unwind agreements | 54.00% |  |  |  |  |  |  |  |  |  |
Net cash received from counterparties for settlement of call options and warrants | 22,200,000 |  |  |  |  |  |  |  |  |  |
Warrants reclassified from equity to liability, at fair value | (47,991,000) |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment maturity period |  |  |  |  |  |  |  |  |  |  | 1 year
Derivative collateral | 818,200,000 | 328,700,000 |  |  |  |  |  |  | 6,700,000 |  |
Derivative instruments, interest rate swaps and caps, duration |  |  |  |  |  |  |  |  | 7 years |  |
Cap rate |  |  |  |  |  |  |  |  |  | 2.50% |
Principal amount of convertible senior notes payable at issuance |  |  |  |  |  |  |  | 200,000,000 |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.50% |  |  |  |
Number of counterparties |  |  |  | 2 | 2 |  |  |  |  |  |
Conversion spread, shares of common stock |  |  | 7,474,817 | 16,000,000 |  |  |  |  |  |  |
Derivative asset, strike price |  |  | $ 12.35 | $ 12.50 |  |  |  |  |  |  |
Number of securities called by warrants |  |  |  |  | 16,000,000 | 7,500,000 |  |  |  |  |
Warrants, exercise price | $ 15.75 |  |  |  | $ 16.00 | $ 15.75 |  |  |  |  |
Warrants, number of shares of common stock deliverable |  |  |  |  | 11,700,000 |  |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  | $ 15,600,000 |  |  |  |  |  |

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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 Outstanding stock warrants that were originally issued with the intention to share settle if holder exercised before expiration, which resulted in the proceeds from the sale of the warrants to be recognized as equity. These warrants subsequently were assigned to a partial unwind agreement to be net cash settled, which required reclassification at fair value from equity to a derivative liability. + 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 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=28364263&loc=d3e13537-108611 + Details
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