Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measure at Fair Value (Details) - Recurring - Marketable securities $ in Thousands	Dec. 31, 2019 USD ($)
Recurring Fair Value Measurements:
Fair value of assets	$ 249,602
Quoted Prices in Active Markets for Identical Assets (Level 1)
Recurring Fair Value Measurements:
Fair value of assets	249,602
Significant Other Observable Inputs (Level 2)
Recurring Fair Value Measurements:
Fair value of assets	0
Significant Unobservable Inputs (Level 3)
Recurring Fair Value Measurements:
Fair value of assets	$ 0