Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 46,948		$ 0	$ 0
Operating lease, liability	$ 46,182
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 51,486
Operating lease, liability		50,180
Reduction in favorable lease assets		2,866
Net deferred rent liabilities		$ 1,560