Financial Derivative Instruments, Part 2 (Details) (Interest Rate Swap Agreement [Member], Interest Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest Rate Swap Agreement [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase Decrease In Interest Expense	$ 117	$ 575	$ 164	$ 236