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Income taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income taxes          
Provision for income tax $ 5,993,000 $ 6,337,000 $ 13,356,000 $ 12,056,000  
Income tax effective rate (as a percent)     33.80% (85.10%)  
Income tax effective rate excluding the impact of the charges related to the U.S. Government resolutions (as a percent)     37.00% 37.90%  
Discontinued operations          
Income tax benefit (expense) 2,044,000 235,000 2,350,000 (298,000)  
Income tax effective rate (as a percent)     44.20% 44.00%  
Income tax effective rate excluding gain on sale of the Breg, Inc. (as a percent)     37.00%    
Gross unrecognized tax benefit 600,000   600,000   700,000
Accrued interest and penalties related to unrecognized tax benefits $ 500,000   $ 500,000   $ 500,000