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Equity (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Equity (Textual) [Abstract]            
Dividend declared per common share $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.42 $ 0.42
Unrealized gain (loss) due to fair value adjustments on interest rate swap agreements, tax $ 399   $ 1,644   $ 24 $ 292
Unrealized gain (loss) due to fair value adjustments on available-for-sale securities, tax 669   353   3,219 1,082
Unrealized gain (loss) due to write off of comprehensive loss related to cash flow hedges, tax           $ 723