Summary of Business and Significant Accounting Policies, Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Recent Accounting Pronouncements Adopted in 2019 [Abstract]
Right-of-use assets	$ 10,410	$ 0	[1]
Lease liability	$ 11,947
ASU 2016-02 [Member]
Recent Accounting Pronouncements Adopted in 2019 [Abstract]
Right-of-use assets		14,589
Lease liability		$ 16,425

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.