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Other intangible assets (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 15,312,000 $ 18,656,000 $ 15,312,000 $ 18,656,000 $ 17,129,000
Amortization of intangible assets 1,000,000 1,000,000 1,800,000 1,900,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
2013 3,700,000   3,700,000    
2014 3,500,000   3,500,000    
2015 2,600,000   2,600,000    
2016 2,200,000   2,200,000    
2017 1,900,000   1,900,000    
Thereafter 3,200,000   3,200,000    
Customer relationships [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 21,310,000 21,010,000 21,310,000 21,010,000 21,310,000
Finite-lived intangible assets, accumulated amortization (12,715,000) (10,690,000) (12,715,000) (10,690,000) (11,701,000)
Intangible assets, net (excluding goodwill) 8,595,000 10,320,000 8,595,000 10,320,000 9,609,000
Noncompete agreements [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 6,186,000 7,086,000 6,186,000 7,086,000 7,236,000
Finite-lived intangible assets, accumulated amortization (4,557,000) (5,057,000) (4,557,000) (5,057,000) (5,326,000)
Intangible assets, net (excluding goodwill) 1,629,000 2,029,000 1,629,000 2,029,000 1,910,000
Other intangible assets [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets, gross 10,979,000 10,978,000 10,979,000 10,978,000 10,979,000
Finite-lived intangible assets, accumulated amortization (5,891,000) (4,671,000) (5,891,000) (4,671,000) (5,369,000)
Intangible assets, net (excluding goodwill) $ 5,088,000 $ 6,307,000 $ 5,088,000 $ 6,307,000 $ 5,610,000