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Equity (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Equity (Textual) [Abstract]        
Unrealized loss due to fair value adjustments on interest rate swap agreements, net of taxes $ 48 $ 3,888 $ 72 $ 4,180
Unrealized (loss) gain due to fair value adjustments on available-for-sale securities, net of taxes 2,760 6,403 459 7,485
Unrealized gain (loss) due to write off of comprehensive loss related to cash flow hedges, tax       $ 723