Basis of Presentation - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Accounting Changes
Lease, Practical Expedients, Package	true
Operating lease right-of-use assets	$ 11,543
Operating lease liability	$ 11,606
ASU 2016-02 | Adjustment
Accounting Changes
Operating lease right-of-use assets		$ 14,200
Operating lease liability		$ 14,200