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Interest Rate Swap Derivatives (Details Narrative)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Number
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Number
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Notional amount $ 250,000   $ 250,000   $ 250,000
Designated cash flow hedge derivatives reclassified from accumulated oci into interest $ 21,069 $ 10,434 $ 52,424 $ 28,980  
Interest Rate Swap [Member]          
Derivative, number of instruments held | Number 3   3    
Notional amount $ 250,000   $ 250,000    
Unrealized gain (loss) on derivatives     6,400   $ 2,300
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net (38) (307) (461) (1,321)  
Estimated amount to be reclassified to interest expense (based on existing interest rates) for cash flow hedges     $ 2,100    
Estimate of time to transfer from AOCI to interest income/expense for designated cash flow hedge derivatives     12 months    
Interest Rate Swap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]          
Designated cash flow hedge derivatives reclassified from accumulated oci into interest $ (214) $ (307) $ 230 $ 1,300