Fair Value Measurements - Schedule Of Fair Value Of Assets (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value Measurements [Line Items]
Assets measured at fair value	$ 22,689	$ 27,119
Mutual Funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	20,260	24,927
Money market funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	2,429	2,192
Level 1
Fair Value Measurements [Line Items]
Assets measured at fair value	20,260	24,927
Level 1 | Mutual Funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	20,260	24,927
Level 1 | Money market funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 2
Fair Value Measurements [Line Items]
Assets measured at fair value	2,429	2,192
Level 2 | Mutual Funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 2 | Money market funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	2,429	2,192
Level 3
Fair Value Measurements [Line Items]
Assets measured at fair value	0	0
Level 3 | Mutual Funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 3 | Money market funds | Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	$ 0	$ 0