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Cash, Cash Equivalents and Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2020
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:
 
March 31, 2020
 
December 31, 2019
(in thousands)
Cash & Cash Equivalents
Marketable Securities
Total
 
Cash & Cash Equivalents
Marketable Securities
Total
 
 
 
 
 
 
 
 
Overnight holdings
$
372,469

$

$
372,469

 
$
349,857

$

$
349,857

Investment holdings
19,494

19,508

39,002

 
13,218

34,728

47,946

Cash in demand accounts
26,266


26,266

 
36,521


36,521

Outstanding checks
(13,501
)

(13,501
)
 
(32,254
)

(32,254
)
Total
$
404,728

$
19,508

$
424,236

 
$
367,342

$
34,728

$
402,070