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Debt (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Apr. 30, 2017
USD ($)
shares
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Dec. 31, 2017
USD ($)
Period
$ / shares
shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Period
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Mar. 21, 2017
USD ($)
Feb. 26, 2016
USD ($)
Debt Instrument [Line Items]                                  
Loss on debt extinguishment         $ 0 $ 0 $ 65,000 $ 0 $ 0 $ 75,223,000 $ 1,868,000 $ 13,440,000 $ 65,000 $ 90,531,000 $ 507,000    
Repayments of Convertible Debt                         $ 145,620,000 363,778,000 11,152,000    
FHLBC advances                                 $ 155,000,000
FHLBC fixed interest rate       1.91%                          
Collateral, principal balance of FHLB (as a percent)       102.00%                 102.00%        
Long-term debt, gross         $ 836,900,000       1,189,500,000       $ 836,900,000 1,189,500,000      
Repayment of long-term debt                         $ 0 0 $ 61,953,000    
2% Convertible Senior Notes due 2020                                  
Debt Instrument [Line Items]                                  
Stated interest rate (in hundredths)         2.00%               2.00%        
Principal amount of notes converted into shares   $ 202,500,000                              
Principal amount of notes redeemed for cash   $ 5,100,000                              
Conversion rate (in shares per $1,000 note) | shares                         143.8332        
Principal amount of notes used in determining conversion rate         $ 1,000               $ 1,000        
Shares issued during period upon conversion of convertible debt (in shares) | shares   29,100,000                              
Loss on debt extinguishment   $ 70,000                       $ 74,300,000      
Extinguishment of debt, amount                   292,400,000              
Repayments of long-term debt                   362,100,000              
Repayments of Convertible Debt                   $ 230,700,000              
Repayments of debt (in shares) | shares                   18,300,000       18,300,000      
Reduction in shares for computation of earnings per share | shares                   42,100,000              
Long-term debt, gross         $ 0       207,600,000       $ 0 $ 207,600,000      
Line of Credit | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Maximum borrowing capacity                               $ 175,000,000  
Revolving credit facility               $ 150,000,000                  
5% Convertible Senior Notes due 2017                                  
Debt Instrument [Line Items]                                  
Stated interest rate (in hundredths)         5.00%               5.00%        
Loss on debt extinguishment                           7,900,000      
Extinguishment of debt, amount                           188,500,000      
Repayments of Convertible Debt $ 145,000,000                         $ 195,500,000      
Reduction in shares for computation of earnings per share | shares                           14,000,000      
Long-term debt, gross         $ 0       145,000,000       $ 0 $ 145,000,000      
Senior Notes | 5.75% Senior Notes due 2023                                  
Debt Instrument [Line Items]                                  
Stated interest rate (in hundredths)         5.75%               5.75%        
Outstanding principal amount     $ 425,000,000                            
Proceeds from issuance of debt     418,100,000                            
Redemption price, percentage (in hundredths)                         100.00%        
Other expenses associated with the issuance of notes     $ 1,200,000                            
Ownership percentage threshold for declaration of due and payable                         25.00%        
Long-term debt, gross         $ 425,000,000       425,000,000       $ 425,000,000 425,000,000      
Senior Notes | 5.75% Senior Notes due 2023 | U.S. Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on redemption premium (as a percent)                         0.50%        
Convertible Junior Subordinated Debentures, at 9% per annum, Due 2063                                  
Debt Instrument [Line Items]                                  
Stated interest rate (in hundredths)         9.00%               9.00%        
Conversion rate (in shares per $1,000 note) | shares                         74.0741        
Principal amount of notes used in determining conversion rate         $ 1,000               $ 1,000        
Loss on debt extinguishment                           8,300,000      
Extinguishment of debt, amount       $ 132,700,000                          
Reduction in shares for computation of earnings per share | shares                         9,800,000        
Redemption price, percentage (in hundredths)                         100.00%        
Long-term debt, gross         $ 256,900,000       $ 256,900,000       $ 256,900,000 256,900,000      
Repayment of long-term debt       $ 150,700,000                          
Reacquisition of convertible junior subordinated debentures-equity component                           $ 6,300,000      
Initial conversion price (in dollars per share) | $ / shares         $ 13.50               $ 13.50        
Period preceding election to convert                         5 days        
Convertible debt, number of equity instruments reserved for conversion | shares         19,000,000               19,000,000        
Closing sale price of our common stock for consideration of redemption (in dollars per share) | $ / shares         $ 17.55               $ 17.55        
Minimum number of trading days                         20 days        
Maximum number of trading days                         30 days        
Minimum number of consecutive interest periods for which interest payments may be deferred | Period         1               1        
Maximum period for which interest payments may be deferred without giving rise to an event of default                         10 years        
Period in which reasonable commercial efforts must begin, maximum                         1 day        
Anniversary payment release of the start of the interest deferral to the Alternative Payment Mechanism in lieu of the final maturity of the debentures                         10 years        
Net proceeds cap (in hundredths)         2.00%               2.00%        
Maximum number of shares of common stock issuable under the Alternative Payment Mechanism (in shares) | shares         10,000,000               10,000,000        
Maximum percentage of aggregate principal amount of the debentures (in hundredths)         25.00%               25.00%