Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Income Taxes    
Income tax expense $ 1,771,000 $ 1,731,000
Income tax expenses related to foreign operations 1,700,000 2,500,000
State income tax expenses 100,000 100,000
U.S. federal income tax benefit related to a prior year settlement   $ 900,000