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Other intangible assets (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 14,092,000 $ 18,015,000 $ 14,092,000 $ 18,015,000 $ 17,129,000
Amortization of intangible assets 1,200,000 1,000,000 3,000,000 2,900,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
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    
2017 1,900,000   1,900,000    
Thereafter 3,300,000   3,300,000    
Customer relationships [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 21,310,000 21,310,000 21,310,000 21,310,000 21,310,000
Intangible assets, accumulated amortization (13,221,000) (11,192,000) (13,221,000) (11,192,000) (11,701,000)
Intangible assets, net (excluding goodwill) 8,089,000 10,118,000 8,089,000 10,118,000 9,609,000
Noncompete agreements [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 6,186,000 7,236,000 6,186,000 7,236,000 7,236,000
Intangible assets, accumulated amortization (4,706,000) (5,198,000) (4,706,000) (5,198,000) (5,326,000)
Intangible assets, net (excluding goodwill) 1,480,000 2,038,000 1,480,000 2,038,000 1,910,000
Other intangible assets [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 10,995,000 10,979,000 10,995,000 10,979,000 10,979,000
Intangible assets, accumulated amortization (6,472,000) (5,120,000) (6,472,000) (5,120,000) (5,369,000)
Intangible assets, net (excluding goodwill) $ 4,523,000 $ 5,859,000 $ 4,523,000 $ 5,859,000 $ 5,610,000