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Stock-Based Compensation (Restricted Stock) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 286,251          
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 692,562          
Granted (in shares) 286,251          
Forfeited (in shares) (68,387)          
Nonvested at the end of the period (in shares) 743,583 692,562        
Additional disclosures            
Proceeds and Excess Tax Benefit from Share-based Compensation   $ 1,100,000 $ 0      
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) 342,454          
Granted (in dollars per share) $ 13.70          
Recognized stock-based compensation expense $ 4,239,000 $ 3,437,000 $ 2,377,000      
Restricted stock unit activity            
Nonvested at the beginning of the period (in shares) 927,082          
Granted (in shares) 342,454          
Vested (in shares) (392,735)          
Forfeited (in shares) (74,862)          
Nonvested at the end of the period (in shares) 801,939 927,082        
Weighted Average Grant-Date Fair Value            
Nonvested at the beginning of the period (in dollars per share) $ 11.19          
Granted (in dollars per share) 13.70          
Vested (in dollars per share) 11.96          
Forfeited (in dollars per share) 12.96          
Nonvested at the end of the period (in dollars per share) $ 11.73 $ 11.19        
Additional disclosures            
Unrecognized stock-based compensation expense $ 4,000,000          
Unrecognized stock-based compensation expense, period of recognition 1 year 256 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 4,366,677          
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 2,834,345          
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 233,799          
1995 Non-Employee Directors' Stock Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years) 1 year          
Granted (in shares) 56,203 109,998 59,985 36,840    
Granted (in dollars per share) $ 13.70 $ 7.00 $ 15.69 $ 24.80    
Restricted stock unit activity            
Granted (in shares) 56,203 109,998 59,985 36,840    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 13.70 $ 7.00 $ 15.69 $ 24.80    
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2014            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ 311,000      
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 0 314,000 627,000      
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 257,000 513,000 0      
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 $ 641,000 $ 0 $ 0      
1995 Executive Incentive Compensation Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)     3 years      
Granted (in shares) 286,251 536,773 239,679 190,832 170,582 141,486
Granted (in dollars per share) $ 13.70 $ 7.09 $ 16.53 $ 25.21 $ 20.63 $ 18.75
Restricted stock unit activity            
Granted (in shares) 286,251 536,773 239,679 190,832 170,582 141,486
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 13.70 $ 7.09 $ 16.53 $ 25.21 $ 20.63 $ 18.75
1995 Executive Incentive Compensation Plan | Restricted stock units | 2012            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 0 $ 0 $ (71,000)      
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 66,000 87,000      
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 316,000 669,000 504,000      
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 597,000 880,000 919,000      
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 1,011,000 995,000 0      
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 $ 1,417,000 $ 0 $ 0