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Other intangible assets (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 18,015,000 $ 22,248,000 $ 18,015,000 $ 22,248,000 $ 20,843,000
Amortization of intangible assets 1,000,000 1,100,000 2,900,000 3,000,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
2012 3,800,000   3,800,000    
2013 3,700,000   3,700,000    
2014 3,400,000   3,400,000    
2015 2,600,000   2,600,000    
2016 2,200,000   2,200,000    
Thereafter 5,200,000   5,200,000    
Customer relationships [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 21,310,000 21,702,000 21,310,000 21,702,000 21,702,000
Finite-lived intangible assets, accumulated amortization (11,192,000) (9,896,000) (11,192,000) (9,896,000) (10,392,000)
Intangible assets, net (excluding goodwill) 10,118,000 11,806,000 10,118,000 11,806,000 11,310,000
Noncompete agreements [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 7,236,000 7,685,000 7,236,000 7,685,000 7,685,000
Finite-lived intangible assets, accumulated amortization (5,198,000) (5,222,000) (5,198,000) (5,222,000) (5,371,000)
Intangible assets, net (excluding goodwill) 2,038,000 2,463,000 2,038,000 2,463,000 2,314,000
Other intangible assets [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 10,979,000 12,901,000 10,979,000 12,901,000 11,442,000
Finite-lived intangible assets, accumulated amortization (5,120,000) (4,922,000) (5,120,000) (4,922,000) (4,223,000)
Intangible assets, net (excluding goodwill) $ 5,859,000 $ 7,979,000 $ 5,859,000 $ 7,979,000 $ 7,219,000