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Stock-Based Compensation (Restricted Stock) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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) 557,073          
Granted (in dollars per share) $ 8.35          
Recognized stock-based compensation expense $ 4,000,000 $ 4,470,000 $ 4,174,000      
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 466,609          
Granted (in shares) 557,073          
Vested (in shares) (230,740)          
Forfeited (in shares) (106,655)          
Nonvested at the end of the period (in shares) 686,287 466,609        
Weighted Average Grant-Date Fair Value            
Nonvested at the beginning of the period (in dollars per share) $ 20.26          
Granted (in dollars per share) 8.35          
Vested (in dollars per share) 18.66          
Forfeited (in dollars per share) 15.67          
Nonvested at the end of the period (in dollars per share) $ 11.84 $ 20.26        
Additional disclosures            
Unrecognized stock-based compensation expense $ 4,600,000          
Unrecognized stock-based compensation expense, period of recognition 1 year 9 months 18 days          
Fair value of RSU, vested in period $ 4,300,000 $ 4,700,000 $ 6,000,000.0      
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 3,000,000.0          
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 2,300,000          
1995 Non-Employee Directors' Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized for issuance 400,000          
Number of shares available for grant 123,000          
1995 Non-Employee Directors' Stock Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 34,986 14,211 43,821 56,203    
Granted (in dollars per share) $ 10.29 $ 25.33 $ 20.54 $ 13.70    
Restricted stock unit activity            
Granted (in shares) 34,986 14,211 43,821 56,203    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 10.29 $ 25.33 $ 20.54 $ 13.70    
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2017            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 179,000      
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 0 280,000 511,000      
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 0 240,000 0      
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 $ 360,000 $ 0 $ 0      
1995 Executive Incentive Compensation Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 522,087 270,864 242,791 286,251 536,773 239,679
Granted (in dollars per share) $ 8.22 $ 22.25 $ 19.93 $ 13.70 $ 7.09 $ 16.53
Restricted stock unit activity            
Granted (in shares) 522,087 270,864 242,791 286,251 536,773 239,679
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 8.22 $ 22.25 $ 19.93 $ 13.70 $ 7.09 $ 16.53
1995 Executive Incentive Compensation Plan | Restricted stock units | 2015            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 193,000      
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 0 290,000 835,000      
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 95,000 832,000 910,000      
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 827,000 1,208,000 1,546,000      
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 1,381,000 1,620,000 0      
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 $ 1,337,000 $ 0 $ 0