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Derivative Instruments (Narrative) (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) | Sep. 30, 2010 USD ($) counterparties $ / shares shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2016 USD ($) shares
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |  |
Derivative collateral |  |  | $ 1,600.0 | $ 827.8 |  | $ 827.8
Credit risk, maximum exposure |  |  | 11.9 | $ 55.5 |  |
Collateral on deposit |  |  | $ 0.5 |  |  |
Derivative [Line Items] |  |  |  |  |  |
Shares of common stock issued to settle warrants that have reached their expiration | shares |  |  |  | 92,998 | 47,868 | 140,866
Call Options [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, term of contract |  |  | 1 year |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, term of contract |  |  | 7 years |  |  |
Interest Rate Caps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, term of contract |  |  | 7 years |  |  |
2015 Notes Hedges [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of counterparties | counterparties |  | 2 |  |  |  |
Conversion spread, shares of common stock | shares |  | 16,000,000 |  |  |  |
Derivative asset, strike price | $ / shares |  | $ 12.50 |  |  |  |
Derivative asset, cash received to settle | $ 25.8 |  |  |  |  |
2015 Notes Embedded Conversion Derivative [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, cash paid to settle conversion premium | $ 25.8 |  |  |  |  |
2015 Warrants [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of securities called by warrants | shares |  | 16,000,000 |  |  | 1,600,000 |
Warrants, exercise price | $ / shares |  | $ 16.00 |  |  | $ 15.59 |
Proceeds from issuance of warrants |  | $ 15.6 |  |  |  |
September 2015 Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 200.0 |  |  |  |
Interest rate |  | 3.50% |  |  |  |
Three Month London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Caps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cap rate |  |  | 2.50% |  |  |

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