Interest Rate Swap Derivatives (Details Narrative) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Number	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Notional amount	$ 250,000		$ 250,000
Interest Rate Swap [Member]
Derivative, number of instruments held | Number	3
Notional amount	$ 250,000
Unrealized gain (loss) on derivatives	4,800		$ 2,300
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net	$ (88)	$ (578)
Estimate of time to transfer from AOCI to interest income/expense for designated cash flow hedge derivatives	12 months
Estimated amount to be reclassified to interest expense (based on existing interest rates) for cash flow hedges	$ 923