Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Accounting Pronouncements Recently Adopted - ASU 2016-02 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 16,400
Operating Leases, Liability, Current	5,187		$ 0
Operating Lease, Liability, Noncurrent	$ 14,029
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 22,700
Operating Leases, Liability, Current		6,200
Operating Lease, Liability, Noncurrent		$ 16,500