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Other intangible assets (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 10,596,000 $ 14,092,000 $ 10,596,000 $ 14,092,000 $ 13,099,000
Amortization of intangible assets 700,000 1,200,000 2,500,000 3,000,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
2014 3,300,000   3,300,000    
2015 2,500,000   2,500,000    
2016 2,200,000   2,200,000    
2017 1,900,000   1,900,000    
2018 1,000,000   1,000,000    
Thereafter 2,200,000   2,200,000    
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 (15,116,000) (13,221,000) (15,116,000) (13,221,000) (13,726,000)
Intangible assets, net (excluding goodwill) 6,194,000 8,089,000 6,194,000 8,089,000 7,584,000
Noncompete agreements [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 5,080,000 6,186,000 5,080,000 6,186,000 6,186,000
Intangible assets, accumulated amortization (4,021,000) (4,706,000) (4,021,000) (4,706,000) (4,840,000)
Intangible assets, net (excluding goodwill) 1,059,000 1,480,000 1,059,000 1,480,000 1,346,000
Other intangible assets [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 10,921,000 10,995,000 10,921,000 10,995,000 10,995,000
Intangible assets, accumulated amortization (7,578,000) (6,472,000) (7,578,000) (6,472,000) (6,826,000)
Intangible assets, net (excluding goodwill) $ 3,343,000 $ 4,523,000 $ 3,343,000 $ 4,523,000 $ 4,169,000