Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 284,369
Operating lease liabilities	$ 288,996
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 301,100
Operating lease liabilities		$ 301,100