XML 67 R95.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Employee Benefit Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
years
period
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Employee Benefit [Line Items]      
Number of Look-back Period Under Employee Stock Purchase Plan | period 2    
Look-back Period Under Employee Stock Purchase Plan 6 months    
Discount On Common Stock Under Employee Stock Purchase Plan, Percent 10.00%    
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares 57,201 50,750 38,387
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 2,100 $ 2,000 $ 1,500
Shares Available For Purchase Under Employee Stock Purchase Plan | shares 303,156    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year $ 21,287 20,553  
Change in actuarial loss 2,663 (31)  
Benefit expense 1,930 1,701  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 966 936  
Balance at end of year $ 24,914 21,287 20,553
Pension Plan [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Requisite Service Period 1 month    
Deferred Compensation Arrangement with Individual, Contribution To Plan By Employee, Percent Of Eligible Compensation 75.00%    
Deferred Compensation Arrangement with Individual, Contribution Requirements, Matching Percent 50.00%    
Deferred Compensation Arrangement with Individual, Contributions by Employer $ 3,500 3,300 2,700
Pension Plan [Member] | Minimum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Eligible Age | years 18    
Pension Plan [Member] | Maximum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation 3.00%    
Deferred Profit Sharing [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Requisite Service Period 1 month    
Deferred Compensation Arrangement with Individual, Contribution To Plan By Employee, Percent Of Eligible Compensation 75.00%    
Deferred Compensation Arrangement with Individual, Contribution Requirements, Matching Percent 50.00%    
Deferred Compensation Arrangement with Individual, Contributions by Employer $ 7,300 7,000 5,700
Deferred Profit Sharing [Member] | Minimum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Eligible Age | years 18    
Deferred Profit Sharing [Member] | Maximum [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation 3.00%    
ESP Plan [Member]      
Employee Benefit [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date 90.00%    
Unit Plans [Member]      
Employee Benefit [Line Items]      
Deferred Compensation Arrangement with Individual, Vesting Period 10    
Deferred Compensation Arrangement with Individual, Benefit Period 10    
Deferred Compensation Arrangement with Individual, Recorded Liability $ 4,000 4,200  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 415 $ 337 $ 452
SERP [Member]      
Employee Benefit [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.34% 4.30%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Normal Retirement Age | years 65    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Annual Cost Of Living Benefit Adjustment 2.00%    
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2020 $ 1,971    
2021 1,116    
2022 1,135    
2023 1,239    
2024 1,438    
2025 through 2029 8,574    
Total $ 15,473