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Other intangible assets (Details 2) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 7,908,000 $ 10,596,000 $ 7,908,000 $ 10,596,000 $ 9,840,000
Amortization of intangible assets 600,000 700,000 2,000,000 2,500,000  
Estimated amortization expense for amortizable intangible assets [Abstract]          
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    
2019 900,000   900,000    
Thereafter 1,400,000   1,400,000    
Customer relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 20,975,000 21,310,000 20,975,000 21,310,000 21,310,000
Intangible assets, accumulated amortization (16,455,000) (15,116,000) (16,455,000) (15,116,000) (15,556,000)
Intangible assets, net (excluding goodwill) 4,520,000 6,194,000 4,520,000 6,194,000 5,754,000
Noncompete agreements [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 4,409,000 5,080,000 4,409,000 5,080,000 5,080,000
Intangible assets, accumulated amortization (3,632,000) (4,021,000) (3,632,000) (4,021,000) (4,098,000)
Intangible assets, net (excluding goodwill) 777,000 1,059,000 777,000 1,059,000 982,000
Other intangible assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 8,300,000 10,921,000 8,300,000 10,921,000 10,921,000
Intangible assets, accumulated amortization (5,689,000) (7,578,000) (5,689,000) (7,578,000) (7,817,000)
Intangible assets, net (excluding goodwill) $ 2,611,000 $ 3,343,000 $ 2,611,000 $ 3,343,000 $ 3,104,000