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Income taxes (Tables)
 6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]  
Income tax rate reconciliation
The following table reconciles the U.S. federal statutory income tax rate to the Company's actual income tax rate from continuing operations:
 
For the three months 
 ended June 30,
 
For the six months 
 ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
U.S. federal statutory income tax rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
U.S. state and local income taxes, net of U.S.
 
 
 
 
 
 
 
                federal income tax effect
(15.3
)%
 
2.5
 %
 
(88.7
)%
 
3.6
 %
Nondeductible charges (1)
(25.0
)%
 
3.2
 %
 
(175.3
)%
 
0.8
 %
Other, net
(3.2
)%
 
(3.2
)%
 
(11.7
)%
 
(0.7
)%
Actual income tax rate
(8.5
)%
 
37.5
 %
 
(240.7
)%
 
38.7
 %