(Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Amount of gain (loss) recognized in OCI on derivative	$ 1,520	$ 416	$ 1,617	$ (402)
Amount of loss reclassified from accumulated OCI into interest	$ 439	$ 628	$ 1,491	$ 1,861