Derivatives and Hedging Activities Other Comprehensive Income (Details) - Parent Company [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,589)	$ (412)
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	(3,705)	(4,347)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1,186	2,192
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	132	114
Other Comprehensive (Loss) Income , Net of Tax, Portion Attributable to Parent	(2,387)	(2,041)
Ending Balance	$ (3,976)	$ (2,453)