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Derivative Instruments (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) | Sep. 30, 2010 USD ($) counterparties $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares shares
Derivative [Line Items] |  |  |  |  |  |  |
Derivative collateral |  |  | $ 98,000 |  | $ 98,000 |  | $ 743,000
Credit risk, maximum exposure |  |  |  |  | 82,800 |  | $ 47,400
Change in fair value of embedded derivatives |  |  | 414,724 | $ 195,206 | 583,112 | $ 21,652 |
Net income |  |  | $ 97,306 | $ 67,815 | $ 186,054 | $ 94,806 |
Earnings per common share - assuming dilution | $ / shares |  |  | $ 1.19 | $ 0.85 | $ 2.33 | $ 1.19 |
2015 Notes Hedges [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of counterparties | counterparties |  | 2 |  |  |  |  |
Derivative, conversion spread, shares of common stock | shares |  | 16.0 |  |  |  |  | 1.8
Derivative asset, strike price | $ / shares |  | $ 12.50 |  |  |  |  | $ 12.25
Derivative asset, cash received to settle | $ 25,800 |  |  |  |  |  |
2015 Notes Embedded Conversion Derivative [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in fair value of embedded derivatives |  |  | $ 1,141 | $ 6,823 | $ 4,516 | $ 31,356 |
Derivative liability, cash paid to settle conversion premium | $ 25,800 |  |  |  |  |  |
2015 Warrants [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Warrants, strike price | $ / shares |  | $ 16.00 |  |  | $ 15.68 |  | $ 15.68
Warrants, number of securities called by warrants | shares |  | 16.0 | 1.8 |  | 1.8 |  | 1.8
Proceeds from issuance of warrants |  | $ 15,600 |  |  |  |  |
September 2015 Notes [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Principal amount of convertible senior notes payable at issuance |  | $ 200,000 |  |  |  |  |
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 |  |  | $ 2,800 |  | $ 2,800 |  |
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 |  |
Change in Assumptions for Fair Value [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in fair value of embedded derivatives |  |  |  |  |  | (62,600) |
Net income |  |  |  |  |  | $ 14,800 |
Earnings per common share - assuming dilution | $ / shares |  |  |  |  |  | $ 0.19 |

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