Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Cash, Cash Equivalents and Marketable Securities [Abstract]

Summary of investments in cash, cash equivalents and marketable securities

2. Cash, Cash Equivalents and Marketable Securities

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

	December 31,
	2018								2017
(in thousands)	Cash & Cash Equivalents			Marketable Securities		Total			Cash & Cash Equivalents			Marketable Securities		Total
Overnight holdings	$	311,158		$	—	$	311,158		$	338,112		$	—	$	338,112
Investments holdings	16,711			60,781		77,492			22,634			1,960		24,594
Cash in demand accounts	33,207			—		33,207			26,700			—		26,700
Outstanding checks	(34,303		)	—		(34,303		)	(33,186		)	—		(33,186		)
Total	$	326,773		$	60,781	$	387,554		$	354,260		$	1,960	$	356,220