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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 26, 2018
Debt Instrument [Line Items]                  
Stock repurchase program, authorized amount                 $ 200,000
Shares repurchased during period (in shares)           16.0      
Shares repurchased, weighted average price per share           $ 10.95   $ 8.03  
Remaining authorized repurchase amount           $ 25,000      
Repayments of convertible debt           0 $ 145,620 $ 363,778  
Loss on debt extinguishment   $ 0 $ 0 $ (65) $ 0 $ 0 $ (65) (90,531)  
Shares repurchased, value               147,100  
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                
Shares issued during period upon conversion of convertible debt (in shares) 29.1                
Treasury stock reissued during period upon conversion of notes (in shares) 18.7                
Stock issued during period upon conversion of notes, new issues (in shares) 10.4                
Extinguishment of debt, amount               292,400  
Repayments of convertible debt               230,700  
Loss on debt extinguishment               74,300  
Repayments of long-term debt               $ 362,100  
Repayments of debt (in shares)               18.3  
5% Convertible Senior Notes due 2017                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)   5.00%         5.00%    
Extinguishment of debt, amount               $ 188,500  
Repayments of convertible debt               195,500  
Loss on debt extinguishment               7,900  
Convertible Junior Subordinated Debentures, at 9% per annum, Due 2063                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)           9.00%      
Extinguishment of debt, amount               132,700  
Loss on debt extinguishment               8,300  
Repayment of long-term debt               150,700  
Reacquisition of convertible junior subordinated debentures-equity component               $ 6,300  
Accumulated other comprehensive loss                  
Debt Instrument [Line Items]                  
Cumulative effect to reclassify certain tax effects from accumulated other comprehensive loss   $ (10,400)         $ (10,422)    
Retained earnings                  
Debt Instrument [Line Items]                  
Cumulative effect to reclassify certain tax effects from accumulated other comprehensive loss   $ 10,400         $ 10,422