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Income tax accounting (Details)	6 Months Ended
Income tax accounting (Details)	Jun. 30, 2013 item	Jun. 30, 2012
Income tax accounting
Number of state jurisdictions in which company is subject to taxation	22
Effective income tax rate (as a percent)	(8.80%)	(6.00%)
US Statutory rate (as a percent)	35.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

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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