Derivative Financial Instruments (Gains (losses) recognized on derivatives (cash flow hedges)) (Details) (Interest Rate Swap, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 39	$ 51
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(57)	(65)
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(376)	62
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(126)	0
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	45	114
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(151)	(151)
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(184)	(81)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(160)	(159)
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(108)	45
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(35)	0
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(106)	45
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(35)	0
Interest Expense | Interest Rate Swap
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
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(107)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	0
Interest Expense | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)		146
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)		(146)
Other Income | Interest Rate Swap
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
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
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
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
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
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
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0
Other Income | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	0
Other Income | Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)		$ 0