Annual report pursuant to Section 13 and 15(d)

Borrowings - Fair Value (Narrative) (Details)

v3.20.4
Borrowings - Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term line of credit $ 100 $ 100
Notes payable to bank | Long-term mortgage notes and bonds payable    
Debt Instrument [Line Items]    
Long-term debt, fair value 628,300  
Secured debt 627,600  
Notes payable to bank | Short-term mortgage notes and bonds payable    
Debt Instrument [Line Items]    
Long-term line of credit $ 100