Summary of Significant Accounting Policies - Leases and Intangible Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) Asset	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Operating lease assets and liabilities
Operating lease, right-of-use assets	$ 16,762	$ 17,997
Operating lease, liability	$ 17,429
Infinite-lived intangible assets
Number of infinite-lived intangible assets | Asset	1
Accounting Standards Update 2016-02 | Restatement Adjustment
Operating lease assets and liabilities
Operating lease, right-of-use assets			$ 23,300
Operating lease, liability			$ 24,000