Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Information [Abstract]

Supplemental cash flow informations [Table Text Block]

Supplemental cash flow information follows: 

	Year Ended December 31,
Supplemental cash flow information	2016			2015			2014
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:
Assets acquired:
Receivables	$	—		$	—		$	1,852
Operating supplies	157			—			61
Prepaid expense	55			—			213
Equipment	2,485			1,264			1,726
Deposits and other	—			11			558
Intangibles	2,191			2,874			8,443
Liabilities assumed	(216		)	—			(1,078		)
Debt issued for purchases of businesses	(875		)	(1,500		)	(2,080		)
Cash paid	$	3,797		$	2,649		$	9,695