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Stock-Based Compensation (Restricted Stock) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Additional disclosures            
Excess tax benefits from stock-based compensation   $ 0        
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 366,349          
Granted (in dollars per share) $ 18.81          
Recognized stock-based compensation expense $ 4,819,000 $ 3,665,000 $ 4,116,000      
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 686,287          
Granted (in shares) 366,349          
Vested (in shares) (307,543)          
Forfeited (in shares) (32,249)          
Nonvested at the end of the period (in shares) 712,844 686,287        
Weighted Average Grant-Date Fair Value            
Nonvested at the beginning of the period (in dollars per share) $ 11.84          
Granted (in dollars per share) 18.81          
Vested (in dollars per share) 13.33          
Forfeited (in dollars per share) 14.16          
Nonvested at the end of the period (in dollars per share) $ 14.68 $ 11.84        
Additional disclosures            
Unrecognized stock-based compensation expense $ 6,000,000          
Unrecognized stock-based compensation expense, period of recognition 1 year 10 months 24 days          
Fair value of RSU, vested in period $ 4,100,000 $ 4,300,000 $ 4,700,000      
Restricted stock units | Officers And Key Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years) 3 years          
Restricted stock units | Non-employee            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years) 1 year          
2013 Equity and Incentive Compensation Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized for issuance 9,900,000          
Number of shares available for grant 2,400,000          
2013 Equity and Incentive Compensation Plan | Equity Awards, Other Than Options And Stock Appreciation Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized for issuance 6,500,000          
Number of shares available for grant 1,800,000          
1995 Non-Employee Directors' Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized for issuance 800,000          
Number of shares available for grant 430,000          
1995 Non-Employee Directors' Stock Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 23,224 34,986 14,211 43,821    
Granted (in dollars per share) $ 21.53 $ 10.29 $ 25.33 $ 20.54    
Restricted stock unit activity            
Granted (in shares) 23,224 34,986 14,211 43,821    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 21.53 $ 10.29 $ 25.33 $ 20.54    
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 280,000      
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2019            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 0 120,000 240,000      
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 120,000 240,000 0      
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2021            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 333,000 $ 0 $ 0      
1995 Executive Incentive Compensation Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 343,125 522,087 270,864 242,791 286,251 536,773
Granted (in dollars per share) $ 18.62 $ 8.22 $ 22.25 $ 19.93 $ 13.70 $ 7.09
Restricted stock unit activity            
Granted (in shares) 343,125 522,087 270,864 242,791 286,251 536,773
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 18.62 $ 8.22 $ 22.25 $ 19.93 $ 13.70 $ 7.09
1995 Executive Incentive Compensation Plan | Restricted stock units | 2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 245,000      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2017            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 0 85,000 763,000      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 142,000 706,000 1,064,000      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2019            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 1,239,000 1,270,000 1,524,000      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 1,093,000 1,244,000 0      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2021            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 1,892,000 $ 0 $ 0