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Goodwill and other intangible assets (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-lived intangible assets [Line Items]      
Intangible assets, net (excluding goodwill) $ 13,099,000 $ 17,129,000  
Amortization of intangible assets 4,000,000 3,800,000 3,700,000
Estimated amortization expense for amortizable intangible assets      
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]      
Other amortizable intangible assets 21,310,000 21,310,000  
Accumulated amortization (13,726,000) (11,701,000)  
Intangible assets, net (excluding goodwill) 7,584,000 9,609,000  
Noncompete agreements [Member]
      
Finite-lived intangible assets [Line Items]      
Other amortizable intangible assets 6,186,000 7,236,000  
Accumulated amortization (4,840,000) (5,326,000)  
Intangible assets, net (excluding goodwill) 1,346,000 1,910,000  
Other [Member}
      
Finite-lived intangible assets [Line Items]      
Other amortizable intangible assets 10,995,000 10,979,000  
Accumulated amortization (6,826,000) (5,369,000)  
Intangible assets, net (excluding goodwill) $ 4,169,000 $ 5,610,000