Leases - Narrative (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Right of use assets, net		$ 51,159
Lease liabilities, net		55,358
Build-to-suit financing lease assets		$ 37,224	$ 36,837	$ 82,933
ASU 2016-02
Lessee, Lease, Description [Line Items]
Right of use assets, net	$ 39,400
Lease liabilities, net	41,500
Lease, right-of-use assets (liabilities), net	(2,100)
Cumulative effect of change related to adoption	159
Build-to-suit financing lease assets	1,000
Operating lease, impairment loss	500
Operating lease, deferred tax effect	300
Retained Earnings | ASU 2016-02
Lessee, Lease, Description [Line Items]
Cumulative effect of change related to adoption	$ 159