Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 27,036
Operating lease liabilities	$ 31,141
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 29,000
Operating lease liabilities		33,000
Right-of-use assets recognized from acquired operating leases		4,000
Liabilities recognized from acquired operating leases		$ 4,000