Supplemental Disclosure to Cash Flows (Tables)

12 Months Ended

Dec. 31, 2018

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 as of and for the years ended December 31 (in thousands):

	2018		2017		2016
Supplemental disclosures:
Cash and cash equivalents	$	349,462	$	75,105	$	40,651
Restricted cash	$	1,565	$	3,333	$	3,317
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	$	351,027	$	78,438	$	43,968
Cash paid for income taxes, net of refunds	$	10,609	$	11,487	$	14,048
Non-cash transactions:
Contingent consideration related to business combinations	$	—	$	1,007	$	3,325
Property and equipment purchases in accounts payable	501		133		82
Non-cash purchase consideration related to business combinations	12,508		—		—
Purchase of assets under capital lease obligations	—		—		134