Derivative Financial Instruments (Gains (losses) recognized on derivatives (cash flow hedges)) (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ (1,579)	$ 2,068	$ (4,496)	$ 1,178
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(465)	(559)	(971)	(1,123)
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	$ 0	$ 0	$ 0	$ 0