Derivatives and Hedging Activities Other Comprehensive Income (Details) - Parent Company [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 1,144	$ (1,589)
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)			(1,343)	(5,019)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 246	$ 1,131	918	2,317
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest			16	141
Other Comprehensive (Loss) Income , Net of Tax, Portion Attributable to Parent			(409)	(2,561)
Ending Balance	$ 735	$ (4,150)	$ 735	$ (4,150)