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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental cash flow information      
Interest paid $ 4,329 $ 3,386 $ 2,948
Income taxes paid, net 10,578 16,679 13,577
Noncash transactions      
Debt issued for purchases of businesses (875) (1,500) (2,080)
Detail of acquisitions:      
Receivables 0 0 1,852
Operating supplies 157 0 61
Prepaid expense 55 0 213
Equipment 2,485 1,264 1,726
Deposits and other 0 11 558
Intangibles 2,191 2,874 8,443
Liabilities assumed 216 0 1,078
Cash paid $ 3,797 $ 2,649 $ 9,695