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Derivative Instruments (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended | 1 Months Ended |  | 1 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 2015 Notes Hedges [Member] | Sep. 30, 2010 2015 Notes Hedges [Member] counterparties | Sep. 30, 2010 2015 Warrants [Member] counterparties | Mar. 31, 2014 2015 Warrants [Member] | Mar. 31, 2014 September 2015 Notes [Member] | Sep. 30, 2010 September 2015 Notes [Member] | Mar. 31, 2014 SunTrust [Member] Not Designated as Hedging Instrument [Member] | Mar. 31, 2014 SunTrust [Member] Three Month London Interbank Offered Rate (LIBOR) [Member] Not Designated as Hedging Instrument [Member] | Mar. 31, 2014 Call Options [Member] | Apr. 28, 2014 Subsequent Event [Member] counterparties partial_unwind_agreement | Apr. 28, 2014 Subsequent Event [Member] 2015 Notes Hedges [Member] | Apr. 28, 2014 Subsequent Event [Member] 2015 Warrants [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment maturity period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Derivative collateral | $ 679.6 | $ 818.2 |  |  |  |  |  |  | $ 4.0 |  |  |  |  |
Credit risk, maximum exposure | 114.5 | 71.7 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, cap interest rate |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |
Interest rate swaps and caps, duration |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
Principal amount of convertible senior notes payable at issuance |  |  |  |  |  |  |  | 200.0 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |
Number of counterparties |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |
Derivative, conversion spread, shares of common stock |  |  | 7.5 | 16.0 |  |  |  |  |  |  |  |  | 4.8 |
Derivative asset, strike price |  |  | $ 12.35 | $ 12.50 |  |  |  |  |  |  |  |  | $ 12.35 |
Warrants, number of securities called by warrants |  |  |  |  | 16.0 |  |  |  |  |  |  |  |  | 4.8
Warrants, strike price |  |  |  |  | $ 16.00 | $ 15.75 |  |  |  |  |  |  |  | $ 15.75
Proceeds from issuance of warrants |  |  |  |  | 15.6 |  |  |  |  |  |  |  |  |
Warrants, deliverable |  |  |  |  | 11.7 |  |  |  |  |  |  |  |  |
Number of partial unwind agreements |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of counterparties, partial unwind agreements |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Net cash received from counterparties for settlement of call options and warrants |  |  |  |  |  |  |  |  |  |  |  | $ 7.2 |  |

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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 Represents the number of years the interest rate swaps and caps have until maturity. + References No definition available. + Details
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- Definition The principal amount of convertible senior notes payable at the time the securities were issued. + 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 Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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=26873400&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=28364263&loc=d3e13537-108611 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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