Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Related party expenses consisted of the following:



		Year Ended December 31,
(in thousands)	Transaction Type	2017		2016		2015
Avista Capital Partners, L.P. and its affiliates*	Offering costs paid on behalf of Avista pursuant to registration rights agreement, advisory services and other charges	$	326	$	12	$	500
Avista Capital Partners, L.P. and its affiliates*	Termination fee	—		—		6,500
INC Research Holdings, Inc.	Pharmacovigilance services	—		780		—
VWR Scientific*	Inventory supplies	297		354		300
Total related party expenses		$	623	$	1,146	$	7,300