Derivatives and Hedging Activities Other Comprehensive Income (Details) - Parent Company [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (412)	$ 108
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	(11,812)	(9,096)
Other Comprehensive Loss, Reclassification Adjustment from AOCI on Derivatives, Net of Tax	5,590	9,399
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	328	(15)
Other Comprehensive (Loss) Income , Net of Tax, Portion Attributable to Parent	(5,894)	$ 288
Ending Balance	$ (6,306)