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Cash, Cash Equivalents and Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
 
December 31, 2018
(in thousands)
Cash & Cash Equivalents
Marketable Securities
Total
 
Cash & Cash Equivalents
Marketable Securities
Total
 
 
 
 
 
 
 
 
Overnight holdings
$
217,270

$
—

$
217,270

 
$
311,158

$
—

$
311,158

Investment holdings
16,156

60,880

77,036

 
16,711

60,781

77,492

Cash in demand accounts
24,465

—

24,465

 
33,207

—

33,207

Outstanding checks
(14,452
)
—

(14,452
)
 
(34,303
)
—

(34,303
)
Total
$
243,439

$
60,880

$
304,319

 
$
326,773

$
60,781

$
387,554