Derivatives and Hedging Activities Other Comprehensive Income (Details) - Parent Company [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,395)	$ (412)	$ 108
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)		(2,543)	(8,400)
Other Comprehensive Loss, Reclassification Adjustment from AOCI on Derivatives, Net of Tax		3,983	6,810
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		(76)	87
Other Comprehensive (Loss) Income , Net of Tax, Portion Attributable to Parent		1,364	$ (1,503)
Ending Balance		$ 952