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Fair Value Measurements - Derivative Instruments, Gain (Loss) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Reclassification of gain (loss)      
Amounts reclassified from Accumulated other comprehensive loss into Interest Expense as a result of forecasted transactions being no longer probable of occurring $ 0 $ 0  
Amount of gain (loss) recognized with respect to effectiveness testing 0 0  
Interest rate swap | Cash flow hedges      
Fair Value Measurements      
Amount of (loss) gain recognized on derivatives in other comprehensive (loss) income (4,928,000) (1,485,000)  
Amount of reclassification from Accumulated other comprehensive (loss) income into Interest expense (110,000) $ 92,000  
Reclassification of gain (loss)      
Additional amount to be reclassified during the next twelve months (1,607,000)    
Credit risk related contingent feature      
Accrued interest payable on derivatives in a liability position 48,000   $ 27,000
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for non-performance risk 6,795,000   1,832,000
Termination liability value 6,795,000   1,832,000
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities      
Credit risk related contingent feature      
Adjustments for non-performance risk $ 300,000   $ 90,000