Supplemental Disclosure to Cash Flows (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Non-Cash and Other Cash Flow Information

Supplemental non-cash and other cash flow information were as follows for the years ended December 31 (in thousands):

	2017		2016		2015
Cash paid for income taxes, net of refunds	$	11,487	$	14,048	$	6,759
Non-cash transactions:
Contingent consideration related to business combinations	$	1,007	$	3,325	$	952
Property and equipment purchases in accounts payable	133		82		315
Purchase of assets under capital lease obligations	—		134		—