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Income taxes (Details)	3 Months Ended
Income taxes (Details)	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Estimated annual effective tax rate (in hundredths)	28.00%
Statutory corporate tax rate (in hundredths)	35.00%

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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