Derivative Financial Instruments (Gains (losses) recognized on derivatives (cash flow hedges)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Expense | Interest Rate Swap 1
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 68	$ 27	$ 162	$ 203
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(63)	(69)	(192)	(210)
Interest Expense | Interest Rate Swap 7
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	193		(117)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(129)		(258)
Interest Expense | Interest Rate Swap 3
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	208	7	387	548
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(153)	(151)	(455)	(446)
Interest Expense | Interest Rate Swap 4
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	248	(15)	8	1,115
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(158)	(156)	(473)	(460)
Interest Expense | Interest Rate Swap 5
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	89		48
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(37)		(74)
Interest Expense | Interest Rate Swap 6
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	88		48
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(37)		(73)
Interest Expense | Interest Rate Swap 2
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	0	138	146	419
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	0	(147)	(146)	(436)
Other Income | Interest Rate Swap 1
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0	0	0
Other Income | Interest Rate Swap 7
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0		0
Other Income | Interest Rate Swap 3
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0	0	0
Other Income | Interest Rate Swap 4
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0	0	0	0
Other Income | Interest Rate Swap 5
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0		0
Other Income | Interest Rate Swap 6
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0		0
Other Income | Interest Rate Swap 2
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	$ 0	$ 0	$ 0	$ 0