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Interest Rate Swap Derivatives (Details Narrative)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Number
Designated cash flow hedge derivatives reclassified from accumulated oci into interest $ 24,117 $ 13,269  
Interest Rate Swap [Member]      
Derivative, number of instruments held | Number     3
Notional amount 100,000   $ 250,000
Unrealized gain (loss) on derivatives 908   $ 3,700
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net (366) $ (88)  
Designated cash flow hedge derivatives reclassified from accumulated oci into interest 27,500    
Estimated amount to be reclassified to interest expense (based on existing interest rates) for cash flow hedges $ 615    
Estimate of time to transfer from AOCI to interest income/expense for designated cash flow hedge derivatives 12 months