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Derivative Instruments (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
counterparties
partial_unwind_agreement
Jun. 30, 2013
Jun. 30, 2014
counterparties
partial_unwind_agreement
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
2015 Notes Hedges [Member]
Sep. 30, 2010
2015 Notes Hedges [Member]
counterparties
Sep. 30, 2010
2015 Warrants [Member]
counterparties
Jun. 30, 2014
2015 Warrants [Member]
Jun. 30, 2014
September 2015 Notes [Member]
Sep. 30, 2010
September 2015 Notes [Member]
Jun. 30, 2014
SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Jun. 30, 2014
SunTrust [Member]
Three Month London Interbank Offered Rate (LIBOR) [Member]
Not Designated as Hedging Instrument [Member]
Jun. 30, 2014
Call Options [Member]
Jun. 30, 2014
Change in Assumptions for Fair Value [Member]
Jun. 30, 2014
Change in Assumptions for Fair Value [Member]
Derivative [Line Items]                                
Investment maturity period                           1 year    
Derivative collateral $ 849,700,000   $ 849,700,000   $ 818,200,000             $ 2,000,000        
Credit risk, maximum exposure     80,200,000   71,700,000                      
Change in fair value of embedded derivatives (80,935,000) 408,409,000 (173,554,000) 45,137,000                     (62,600,000) (62,600,000)
Net income 36,744,000 120,113,000 26,991,000 146,144,000                     14,800,000 14,800,000
Earnings per common share - assuming dilution $ 0.46 $ 1.71 $ 0.34 $ 2.09                     $ 0.19 $ 0.19
Derivative, cap interest rate                         2.50%      
Interest rate swaps and caps, duration                       7 years        
Principal amount of convertible senior notes payable at issuance                     200,000,000          
Debt instrument, interest rate, stated percentage                   3.50%            
Number of counterparties             2 2                
Derivative, conversion spread, shares of common stock           3.7 16.0                  
Derivative asset, strike price           $ 12.35 $ 12.50                  
Warrants, number of securities called by warrants               16.0 3.7              
Warrants, strike price               $ 16.00 $ 15.75              
Proceeds from issuance of warrants               15,600,000                
Warrants, deliverable               11.7                
Number of partial unwind agreements 4   4                          
Number of counterparties, partial unwind agreements 2   2                          
Net cash received from counterparties for settlement of call options and warrants $ 10,400,000