Leases - Additional Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, renewal term	10 years
Operating lease right-of-use assets	$ 17,982
Long-term operating lease liabilities	$ 18,256
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 18,400
Long-term operating lease liabilities		$ 18,400
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, remaining lease term	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, remaining lease term	19 years