Financial Derivatives (Schedule of Effect of Derivative Instruments on the Statement of Income) (Details) (Interest Rate Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 106	$ (224)	$ 301	$ (66)
Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (192)	$ (186)	$ (551)	$ (541)
Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Other income (expense)	Other income (expense)	Other income (expense)	Other income (expense)