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SENIOR UNSECURED DEBT (Narrative) (Details) - Senior Notes - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 22, 2017
Oct. 18, 2016
Senior Notes Due 2026              
Debt Instrument [Line Items]              
Debt instrument, face amount             $ 53,600,000.0
Stated interest rate             6.875%
Discount (premium) and direct issuance costs $ 2,308,000   $ 2,308,000   $ 2,584,000   $ 3,800,000
Notes payable, fair value disclosure 14,600,000   14,600,000        
Interest expense, including amortization of discount and debt issuance costs 1,000,000 $ 1,000,000 $ 3,000,000 $ 3,000,000      
Senior Notes Due 2026 | On or After August 15, 2019              
Debt Instrument [Line Items]              
Redemption percentage     100.00%        
Senior Notes Due 2024              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 69,000,000.0  
Stated interest rate           7.25%  
Discount (premium) and direct issuance costs 1,329,000   $ 1,329,000   $ 1,629,000 $ (2,800,000)  
Notes payable, fair value disclosure 20,500,000   20,500,000        
Interest expense, including amortization of discount and debt issuance costs $ 1,400,000 $ 1,400,000 $ 4,100,000 $ 4,100,000      
Senior Notes Due 2024 | On or After January 30, 2020              
Debt Instrument [Line Items]              
Redemption percentage     100.00%