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Derivative Instruments (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
partial_unwind_agreement
counterparties
Dec. 31, 2012
Dec. 31, 2013
2015 Notes Hedges [Member]
Sep. 30, 2010
2015 Notes Hedges [Member]
counterparties
Sep. 30, 2010
2015 Warrants [Member]
counterparties
Dec. 31, 2013
2015 Warrants [Member]
Dec. 31, 2013
September 2015 Notes [Member]
Sep. 30, 2010
September 2015 Notes [Member]
Dec. 31, 2013
SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
SunTrust [Member]
Three Month London Interbank Offered Rate (LIBOR) [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Call Options [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]                      
Credit risk, maximum exposure $ 71,700,000 $ 93,700,000                  
Number of partial unwind agreements 3                    
Number of counterparties, partial unwind agreements 2                    
Percentage of outstanding call options and warrants settled pursuant to partial unwind agreements 54.00%                    
Net cash received from counterparties for settlement of call options and warrants 22,200,000                    
Warrants reclassified from equity to liability, at fair value (47,991,000)                    
Derivative [Line Items]                      
Investment maturity period                     1 year
Derivative collateral 818,200,000 328,700,000             6,700,000    
Derivative instruments, interest rate swaps and caps, duration                 7 years    
Cap rate                   2.50%  
Principal amount of convertible senior notes payable at issuance               200,000,000      
Interest rate, stated percentage             3.50%        
Number of counterparties       2 2            
Conversion spread, shares of common stock     7,474,817 16,000,000              
Derivative asset, strike price     $ 12.35 $ 12.50              
Number of securities called by warrants         16,000,000 7,500,000          
Warrants, exercise price $ 15.75       $ 16.00 $ 15.75          
Warrants, number of shares of common stock deliverable         11,700,000            
Proceeds from issuance of warrants         $ 15,600,000