XML 96 R82.htm IDEA: XBRL DOCUMENT v3.3.1.900
Derivative Instruments (Narrative) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 15, 2015
USD ($)
Sep. 30, 2010
USD ($)
counterparties
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
partial_unwind_agreement
$ / shares
shares
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
partial_unwind_agreement
$ / shares
shares
Dec. 31, 2013
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]                          
Derivative collateral     $ 349,800       $ 743,000       $ 349,800 $ 743,000  
Credit risk, maximum exposure                     36,900 $ 47,400  
Number of partial unwind agreements | partial_unwind_agreement             5         5  
Net cash received from counterparties for settlement of call options and warrants                       $ 16,600  
Warrants reclassified from equity to a derivative liability, at fair value                       (51,257) $ (47,991)
Derivative [Line Items]                          
Change in fair value of embedded derivatives                     464,698 (32,321) (133,968)
Net income     $ 33,776 $ 97,306 $ 82,845 $ 5,903 $ 31,217 $ 67,815 $ 36,744 $ (9,753) $ 219,830 $ 126,023 253,283
Shares of common stock issued to settle warrants that have reached their expiration | shares                     47,868    
2015 Notes Hedges [Member]                          
Derivative [Line Items]                          
Number of counterparties | counterparties   2                      
Conversion spread, shares of common stock | shares   16,000,000         1,800,000         1,800,000  
Derivative asset, strike price | $ / shares   $ 12.50         $ 12.25         $ 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                     $ 4,516 $ 19,036 $ (141,974)
Derivative liability, cash paid to settle conversion premium $ 25,800                        
2015 Warrants [Member]                          
Derivative [Line Items]                          
Number of securities called by warrants | shares   16,000,000 1,600,000       1,800,000       1,600,000 1,800,000  
Warrants, exercise price | $ / shares   $ 16.00                 $ 15.59 $ 15.68  
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                      
Interest rate   3.50%                      
SunTrust [Member] | Not Designated as Hedging Instrument [Member]                          
Derivative [Line Items]                          
Derivative instruments, interest rate swaps and caps, duration                     7 years    
Collateral on deposit     $ 1,500               $ 1,500    
SunTrust [Member] | Three Month London Interbank Offered Rate (LIBOR) [Member] | Not Designated as Hedging Instrument [Member]                          
Derivative [Line Items]                          
Cap rate     2.50%               2.50%    
Change in Assumptions for Fair Value [Member]                          
Derivative [Line Items]                          
Change in fair value of embedded derivatives                       $ (62,600)  
Net income                       $ 14,800  
Call Options [Member]                          
Derivative [Line Items]                          
Investment maturity period                     1 year