Significant Accounting Policies - Recent Accounting Pronouncements - ASC 842 Leases (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019	Jan. 01, 2018
Accounting Changes
Operating lease right-of-use assets		$ 14,453
Operating lease liability		$ 14,496
ASU 2016-01 Financial Instruments
Accounting Changes
Change in Accounting Principle, Accounting Standards Update, Adopted			true
ASU 2016-02 Leases
Accounting Changes
Change in Accounting Principle, Accounting Standards Update, Adopted	true
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated	true
Operating lease right-of-use assets	$ 14,200
Operating lease liability	$ 14,200