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Cash, Cash Equivalents and Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018
 
December 31, 2017
(in thousands)
Cash & Cash Equivalents
Marketable Securities
Total
 
Cash & Cash Equivalents
Marketable Securities
Total
 
 
 
 
 
 
 
 
Overnight holdings
$
270,172

$
—

$
270,172

 
$
338,112

$
—

$
338,112

Investments holdings
43,989

37,576

81,565

 
22,634

1,960

24,594

Cash in demand accounts
29,585

—

29,585

 
26,700

—

26,700

Outstanding checks
(15,447
)
—

(15,447
)
 
(33,186
)
—

(33,186
)
Total
$
328,299

$
37,576

$
365,875

 
$
354,260

$
1,960

$
356,220