Fair Value of Assets and Liabilities (Textuals) (Details)	12 Months Ended	1 Months Ended
	Dec. 31, 2011	Oct. 31, 2010 Interest rate swap [Member] Derivative	Dec. 31, 2011 Interest rate swap [Member] Derivative
Derivative [Line Items]
Number of interest rate swap contracts			2
Number of interest rate swaps expired		1
Fair Value of Assets and Liabilities (Textuals)
Cash collection percentage	70.00%
Contingent consideration collection period	5 years