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Shareholders' Equity (Details) - USD ($)
 105 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2015
Dec. 31, 2011
Dec. 31, 2008
Class of Stock [Line Items]          
Common stock, shares authorized (shares) 195,000,000 195,000,000      
Common stock, par value (in dollars per share) $ 0.01 $ 0.01      
Common stock, shares issued (shares) 99,876,385 99,510,499      
Common stock, shares outstanding (shares) 92,689,864 92,323,978      
Preferred stock, shares authorized (shares) 5,000,000 5,000,000      
Preferred stock, shares issued (shares)         160,000
Conversion of convertible preferred stock (shares) 100        
Liquidation preference (in dollars per share) $ 0.01        
Authorized repurchase amount $ 130,000,000     $ 60,000,000  
Additional repurchase amount     $ 70,000,000    
Treasury stock, common (in shares) 7,186,521        
Treasury stock, value $ 86,300,000 $ 86,300,000      
Repurchase of common stock (shares) 0        
Remaining authorized repurchase amount $ 43,700,000        
Series A Convertible Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01      
Shares, outstanding (in shares) 52,284 53,854