Recent Accounting Pronouncements - Additional Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 18,202
Operating lease liabilities	$ 18,416
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 18,400
Operating lease liabilities		$ 18,400