Cash, Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

Cash, Cash Equivalents and Marketable Securities [Abstract]

Summary of investments in cash, cash equivalents and marketable securities

The following table summarizes our cash and investments in cash equivalents and marketable securities held by investment managers and overnight investments:

	September 30, 2017			December 31, 2016
	(in thousands)
Overnight holdings
Money market funds (cash equivalents)	$	260,000		$	255,091
Investment holdings
Money market funds (cash equivalents)	16,392			28,231
Marketable securities	1,950			1,851
	278,342			285,173
Cash held in demand accounts	25,648			25,758
Outstanding checks	(16,106		)	(23,046		)
Total cash, cash equivalents and marketable securities	$	287,884		$	287,885
Cash and cash equivalents	$	285,934		$	286,034
Marketable securities	1,950			1,851
Total cash, cash equivalents and marketable securities	$	287,884		$	287,885