Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Fair value information related to assets
Assets		$ 79,758	$ 3,230
Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets		79,758	3,230
Money market funds
Fair value information related to assets
Assets	[1]	77,125	123
Money market funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[1]	77,125	123
Other mutual funds
Fair value information related to assets
Assets	[2]	2,633	3,107
Other mutual funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[2]	$ 2,633	$ 3,107

[1] ^{(1) We include money market funds in “Cash and cash equivalents” in the Condensed Consolidated Balance Sheets. We classify these investments as available-for-sale and record them at fair value. There have been no realized gains or losses related to these investments and we have not experienced any redemption restrictions with respect to any of the money market mutual funds. A portion of the funds borrowed during the three months ended March 31, 2020 under the 2018 Credit Facility were deposited into money market funds. Refer to Note 12 – Debt and Finance Lease Obligations for additional information.}

[2] We include other mutual funds in “Other investments and assets” in the Condensed Consolidated Balance Sheets.