Derivative Financial Instruments (Gains (Losses) Recognized on Derivatives (Cash Flow Hedges)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Interest Expense | Interest Rate Swap 1
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 14	$ (488)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(298)	(216)
Interest Expense | Interest Rate Swap 2
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	324	(39)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(536)	(573)
Interest Expense | Interest Rate Swap 3
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(122)	(1,195)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(561)	(589)
Interest Expense | Interest Rate Swap 4
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	(436)	(2,109)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	(589)	(618)
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	(227)
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
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
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