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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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The amount of cash received at maturity to settle the derivative asset.

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Exercise price of the warrants.

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