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Shareholders’ Equity (Details) - USD ($)
3 Months Ended 48 Months Ended 99 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2015
Dec. 31, 2011
Dec. 31, 2008
Class of Stock [Line Items]                
Common stock, shares authorized (in shares) 195,000,000   195,000,000 195,000,000 195,000,000      
Common stock, par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01 $ 0.01      
Common stock, shares issued (in shares) 95,994,278   95,994,278 95,994,278 95,289,961      
Common stock, shares, outstanding (in shares) 88,807,757   88,807,757 88,807,757 88,103,440      
Preferred stock, shares authorized (in shares) 5,000,000   5,000,000 5,000,000 5,000,000      
Preferred stock par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01 $ 0.01      
Preferred shares issued (in shares)               160,000
Number of shares issued for each share of preferred stock (in shares) 100   100 100        
Stock repurchase program, authorized amount $ 130,000,000   $ 130,000,000 $ 130,000,000   $ 70,000,000 $ 60,000,000  
Treasury stock, shares, acquired (in shares)     0 7,186,521        
Treasury stock, value, acquired, cost method       $ 86,300,000        
Stock repurchase program, remaining authorized repurchase amount $ 43,700,000   $ 43,700,000 $ 43,700,000        
Series A Convertible Preferred Stock [Member]                
Class of Stock [Line Items]                
Preferred shares outstanding (in shares) 68,944   68,944 68,944 71,967      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Beginning balance (in shares) 71,967 74,364            
Conversion of convertible preferred stock (in shares) (3,023) (133)            
Issuance for stock compensation plans (in shares) 0 0            
Shares, Ending balance (in shares) 68,944.000 74,231 68,944.000 68,944.000        
Treasury [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Beginning balance (in shares) 7,186,521 7,186,521            
Conversion of convertible preferred stock (in shares) 0 0            
Issuance for stock compensation plans (in shares) 0 0            
Shares, Ending balance (in shares) 7,186,521.000 7,186,521 7,186,521.000 7,186,521.000        
Common stock [Member]                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares, Beginning balance (in shares) 88,103,440 87,544,777            
Conversion of convertible preferred stock (in shares) 302,255 13,343            
Issuance for stock compensation plans (in shares) 402,062 17,749            
Shares, Ending balance (in shares) 88,807,757.000 87,575,869 88,807,757.000 88,807,757.000