(Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Amount of gain (loss) recognized in OCI on derivative	$ (64)	$ (521)	$ 97	$ (818)
Amount of loss reclassified from accumulated OCI into interest	$ 497	$ 640	$ 1,052	$ 1,233