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Shareholders’ Equity (Details) - USD ($)
6 Months Ended 51 Months Ended 102 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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) 96,080,288   96,080,288 96,080,288 95,289,961      
Common stock, shares, outstanding (in shares) 88,893,767   88,893,767 88,893,767 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 $ 130,000,000.0   $ 130,000,000.0 $ 130,000,000.0   $ 70,000,000.0 $ 60,000,000.0  
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) 68,575   68,575 68,575 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) (3,392) (241)            
Issuance for stock compensation plans (in shares) 0 0            
Shares, Ending balance (in shares) 68,575 74,123 68,575 68,575        
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 7,186,521 7,186,521 7,186,521        
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) 339,166 24,167            
Issuance for stock compensation plans (in shares) 451,161 32,147            
Shares, Ending balance (in shares) 88,893,767 87,601,091 88,893,767 88,893,767