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Other intangible assets (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net (excluding goodwill) $ 12,296,000 $ 16,318,000 $ 13,099,000
Amortization of intangible assets 800,000 800,000  
Estimated amortization expense for amortizable intangible assets [Abstract]      
2014 3,200,000    
2015 2,500,000    
2016 2,200,000    
2017 2,000,000    
2018 1,000,000    
Thereafter 2,200,000    
Customer relationships [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 21,310,000 21,310,000 21,310,000
Intangible assets, accumulated amortization (14,230,000) (12,211,000) (13,726,000)
Intangible assets, net (excluding goodwill) 7,080,000 9,099,000 7,584,000
Noncompete agreements [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 5,580,000 7,236,000 6,186,000
Intangible assets, accumulated amortization (4,335,000) (5,439,000) (4,840,000)
Intangible assets, net (excluding goodwill) 1,245,000 1,797,000 1,346,000
Other intangible assets [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 10,920,000 10,979,000 10,995,000
Intangible assets, accumulated amortization (6,949,000) (5,557,000) (6,826,000)
Intangible assets, net (excluding goodwill) $ 3,971,000 $ 5,422,000 $ 4,169,000