Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right of use assets	$ 149,578
Operating lease liabilities	175,257
Increase to accumulated deficit	$ 678,464	$ 542,169
Lease renewal term	5 years
Lease termination term	1 year
Amortization and impairment	$ 21,088
Interest accretion	17,489
Rental expense	38,577	$ 38,893	$ 34,858
One Lease, Lessor Affiliate of Significant Investor
Lessee, Lease, Description [Line Items]
Operating lease right of use assets	1,288
Operating lease liabilities	1,351
Rental expense	$ 458
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	14 years
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right of use assets				$ 128,890
Operating lease liabilities				153,676
Deferred rent				22,881
Tenant improvements receivable				355
Increase to accumulated deficit				$ 1,550