Annual report pursuant to Section 13 and 15(d)

Description of business and basis of presentation (Details)

v3.20.4
Description of business and basis of presentation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
company
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Interim Consolidated Financial Information      
Number of companies | company 15    
Number of operating segments | segment 2    
Non-qualified benefit plan assets $ 9,041 $ 7,270  
Retained earnings 47,712 160,748  
Non-qualified plan      
Interim Consolidated Financial Information      
Amount accrued 9,318 $ 7,679 $ 5,243
ASU 2016-13      
Interim Consolidated Financial Information      
Retained earnings $ 557