XML 71 R59.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 10,000.0 27,000.0 74,000.0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 800 $ 600 $ 2,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 17.11 $ 17.11 $ 22.21        
Stock-based Compensation $ 500 $ 500 $ 1,300        
Restricted Stock Shares Authorized             900,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 400,000            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 200            
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Exercise Price $ 21.82 $ 21.53 $ 18.36        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]              
Unvested at beginning of year, Number of Restricted Stock Awards (in shares) 53,700 53,000.0 102,400        
Unvested at end of year, Number of Restricted Stock Awards (in shares) 26,500 53,700 53,000.0 102,400      
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Exercise Price $ 21.31 $ 21.82 $ 21.53 $ 18.36      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18.58 $ 22.98 $ 17.27        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (35,700) (25,300) (122,200)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 21.48 $ 22.07 $ 16.21        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (1,500) (1,000.0) (1,200)        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 9 months 18 days            
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
weighted average fair value price of stock awards upper $ 19.03 $ 23.37 $ 18.78 27.29 $ 27.47 $ 18.18  
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
weighted average fair value price of stock awards lower $ 18.12 $ 20.53 $ 17.06 $ 19.93 $ 21.72 $ 13.86