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Stockholders' Equity (Narrative) (Details) - USD ($)
12 Months Ended
May 02, 2017
Apr. 27, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 04, 2019
Jan. 30, 2019
Dec. 05, 2018
Dec. 31, 2017
Feb. 04, 2016
Equity [Abstract]                    
Authorized serial preferred stock (in shares)     50,000,000              
Serial preferred stock, par value (in dollars per share)     $ 0.01              
Preferred stock issued (in shares)     0              
Stock repurchase program, authorized amount           $ 10,000,000.0 $ 10,000,000.0 $ 10,000,000.0   $ 10,000,000.0
Number of shares repurchased (in shares)     103,758 725,583 0          
Subsidiary, Sale of Stock [Line Items]                    
Common stock, par value (in dollars per share)     $ 0.01 $ 0.01            
Proceeds from the issuance of common stock $ 82,000,000.0                  
Liquidation account, total     $ 11,900,000 $ 13,000,000.0         $ 15,100,000  
Public stock offering                    
Subsidiary, Sale of Stock [Line Items]                    
Shares in offering (in shares)   5,175,000                
Common stock, par value (in dollars per share)   $ 0.01                
Sale of stock price (in usd per share)   $ 14.50                
Underwriters option                    
Subsidiary, Sale of Stock [Line Items]                    
Shares in offering (in shares) 5,951,250 776,250                
Sale of stock price (in usd per share) $ 14.50