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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Assets
As of December 31, 2018 and 2017, the Company had the following assets measured at fair value on a recurring basis:
 
Fair Value Measurements at Reporting Date Using
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets
(in thousands)
December 31, 2018
 
 
 
 
 
 
 
Mutual funds(1)
$
19,378

 
$
19,378

 
$
—

 
$
—

Money market funds(1)
1,923

 
—

 
1,923

 
—

Total
$
21,301

 
$
19,378

 
$
1,923

 
$
—

December 31, 2017
 
 
 
 
 
 
 
Money market funds, included in cash and cash equivalents
$
50,419

 
$
—

 
$
50,419

 
$
—

Mutual funds(1)
20,869

 
20,869

 
—

 
—

Money market funds(1)
1,702

 
—

 
1,702

 
—

Total
$
72,990

 
$
20,869

 
$
52,121

 
$
—

(1) Included in Investments, employee benefit plans, at fair value and other current assets on the consolidated balance sheets.