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Derivative Financial Instruments and Hedging Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]        
Unrealized Gain (Loss) on Derivatives   $ 0 $ (13,000) $ 6,800
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net   1,300    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   $ (1,300) $ 100 $ 400
Payments for (Proceeds from) Hedge, Financing Activities $ 15,900