XML 64 R46.htm IDEA: XBRL DOCUMENT v3.20.4
Stock Based Compensation Stock Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,250,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,150,810    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 8,400,000 $ 14,500,000 $ 600,000
Share-based Payment Arrangement, Expense 3,900,000 $ 3,600,000 $ 3,900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 9,000,000.0    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 1 month 6 days    
Stock Units Awarded Under the 2009 LTIP Plan 24,000 24,000 21,000
Value of Stock Units Awarded Under the 2009 LTIP Plan $ 652,000 $ 680,000 $ 651,000
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan 8,059    
Value of Units Outstanding Under the 2006 Director Equity Plan $ 200,000    
Stock or Unit Option Plan Expense $ (400,000) (200,000) (200,000)
Total Stock Units Outstanding Under All Stock Option Plans 50,579    
Total Value of Units Outstanding Under All Stock Option Plans $ 1,300,000    
Deferred Compensation Equity 2,200,000    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 1,200,000    
Deferred Compensation Liability, Current and Noncurrent $ 200,000 $ 200,000 $ 200,000