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Stock-Based Compensation (Restricted Stock) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 240,008          
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 743,583          
Granted (in shares) 240,008          
Forfeited (in shares) (34,426)          
Nonvested at the end of the period (in shares) 494,882 743,583        
Additional disclosures            
Proceeds and Excess Tax Benefit from Share-based Compensation   $ 1,100,000        
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) 286,612          
Granted (in dollars per share) $ 20.03          
Recognized stock-based compensation expense $ 4,530,000 $ 4,239,000 $ 3,437,000      
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 801,939          
Granted (in shares) 286,612          
Vested (in shares) (478,917)          
Forfeited (in shares) (26,254)          
Nonvested at the end of the period (in shares) 583,380 801,939        
Weighted Average Grant-Date Fair Value            
Nonvested at the beginning of the period (in dollars per share) $ 11.73          
Granted (in dollars per share) 20.03          
Vested (in dollars per share) 12.48          
Forfeited (in dollars per share) 14.11          
Nonvested at the end of the period (in dollars per share) $ 15.08 $ 11.73        
Additional disclosures            
Unrecognized stock-based compensation expense $ 4,900,000          
Unrecognized stock-based compensation expense, period of recognition 1 year 8 months 12 days          
2013 Equity and Incentive Compensation Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized for issuance 7,800,000          
Number of shares available for grant 3,695,156          
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]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 4,621,000          
Number of shares available for grant 2,374,533          
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 194,370          
1995 Non-Employee Directors' Stock Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years) 3 years          
Granted (in shares) 43,821 56,203 109,998 59,985    
Granted (in dollars per share) $ 20.54 $ 13.70 $ 7.00 $ 15.69    
Restricted stock unit activity            
Granted (in shares) 43,821 56,203 109,998 59,985    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 20.54 $ 13.70 $ 7.00 $ 15.69    
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2015            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 314,000      
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 0 257,000 513,000      
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 179,000 641,000 0      
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 $ 511,000 $ 0 $ 0      
1995 Executive Incentive Compensation Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 242,791 286,251 536,773 239,679 190,832 170,582
Granted (in dollars per share) $ 19.93 $ 13.70 $ 7.09 $ 16.53 $ 25.21 $ 20.63
Restricted stock unit activity            
Granted (in shares) 242,791 286,251 536,773 239,679 190,832 170,582
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 19.93 $ 13.70 $ 7.09 $ 16.53 $ 25.21 $ 20.63
1995 Executive Incentive Compensation Plan | Restricted stock units | 2013            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 66,000      
1995 Executive Incentive Compensation Plan | Restricted stock units | 2014            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense 0 316,000 669,000      
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 230,000 597,000 880,000      
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 935,000 1,011,000 995,000      
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 1,019,000 1,417,000 0      
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 $ 1,656,000 $ 0 $ 0