Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies ASC 842 adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset	$ 15,041
Operating lease liability	$ 17,483
Other non-current assets | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset		$ 14,100
Other current and non-current liabilities | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability		$ 17,900