Business Overview and Summary of Significant Accounting Policies - Other (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Recently Issued Accounting Pronouncements
Lease, Practical Expedient, Use of Hindsight	false
Lease, Practical Expedients, Package	true
Right-to-use assets	$ 7,271
Operating lease liabilities	$ 8,389
Accounting Standards Update 2016-02 | Adjustment
Recently Issued Accounting Pronouncements
Right-to-use assets		$ 8,025
Operating lease liabilities		$ 8,813