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Derivative Instruments (Narrative) (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2010 USD ($) counterparties $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) $ / shares shares
Derivative [Line Items] |  |  |  |
Derivative collateral |  | $ 326.2 | $ 326.2 | $ 349.8
Credit risk, maximum exposure |  | $ 74.4 |  | $ 36.9
Shares of common stock issued to settle warrants that have reached their expiration | shares |  | 79,899 | 127,767 |
2015 Notes Hedges [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Number of counterparties | counterparties | 2 |  |  |
Derivative, conversion spread, shares of common stock | shares | 16,000,000 |  |  |
Derivative asset, strike price | $ / shares | $ 12.50 |  |  |
2015 Warrants [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Warrants, number of securities called by warrants | shares | 16,000,000 | 800,000 | 800,000 | 1,600,000
Warrants, strike price | $ / shares | $ 16.00 | $ 15.59 |  | $ 15.59
Proceeds from issuance of warrants | $ 15.6 |  |  |
September 2015 Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Principal amount of convertible senior notes payable at issuance | $ 200.0 |  |  |
Debt instrument, interest rate, stated percentage | 3.50% |  |  |
SunTrust [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate swaps and caps, duration |  | 7 years |  |
Collateral on deposit |  | $ 4.3 | $ 4.3 |
SunTrust [Member] | Three Month London Interbank Offered Rate (LIBOR) [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, cap interest rate |  | 2.50% | 2.50% |
Call Options [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Investment maturity period |  | 1 year |  |

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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 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 + 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=49121117&loc=d3e13537-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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