Derivative Financial Instruments (Gains (losses) recognized on derivatives (cash flow hedges)) (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 43	$ 39
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(44)	(57)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(661)	(376)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(109)	(126)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	93	45
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(142)	(151)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(309)	(184)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(155)	(160)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(140)	(108)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(27)	(35)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(136)	(106)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(29)	(35)
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(898)	(107)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	0	0
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(909)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	0
Interest Expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)		(93)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)		0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	$ 0
Other Income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)		$ 0