Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Foreign Exchange Derivative Instruments [Member]
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Debt instrument outstanding	$ 0	$ 0
Senior Notes [Member] | Interest rate swaps [Member]
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Debt instrument outstanding	30,000	30,000
Interest Rate	5.60%	5.60%
Borrowings [Member] | Interest rate swaps [Member]
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Debt instrument outstanding	$ 33,000	$ 33,000
Interest Rate	3.30%	3.30%