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Other intangible assets (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 18,656,000 $ 23,337,000 $ 18,656,000 $ 23,337,000 $ 20,843,000
Amortization of intangible assets 1,000,000 1,000,000 1,900,000 1,900,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
2012 3,800,000   3,800,000    
2013 3,600,000   3,600,000    
2014 3,300,000   3,300,000    
2015 2,600,000   2,600,000    
2016 2,100,000   2,100,000    
Thereafter 5,200,000   5,200,000    
Customer relationships [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 21,010,000 21,702,000 21,010,000 21,702,000 21,702,000
Finite-lived intangible assets, accumulated amortization (10,690,000) (9,395,000) (10,690,000) (9,395,000) (10,392,000)
Intangible assets, net (excluding goodwill) 10,320,000 12,307,000 10,320,000 12,307,000 11,310,000
Noncompete agreements [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 7,086,000 7,685,000 7,086,000 7,685,000 7,685,000
Finite-lived intangible assets, accumulated amortization (5,057,000) (5,062,000) (5,057,000) (5,062,000) (5,371,000)
Intangible assets, net (excluding goodwill) 2,029,000 2,623,000 2,029,000 2,623,000 2,314,000
Other intangible assets [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 10,978,000 12,899,000 10,978,000 12,899,000 11,442,000
Finite-lived intangible assets, accumulated amortization (4,671,000) (4,492,000) (4,671,000) (4,492,000) (4,223,000)
Intangible assets, net (excluding goodwill) $ 6,307,000 $ 8,407,000 $ 6,307,000 $ 8,407,000 $ 7,219,000