Commitments and Contingencies - Minimum Aggregate Future Obligations Under Non-cancelable Leases and Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
2019	$ 54,561
2020	78,683
2021	75,991
2022	72,579
2023	70,101
Thereafter	599,339
Total	951,254
Rent expense	63,200	$ 58,800	$ 50,300
Proceeds from sublease tenants	3,800	$ 3,600	$ 1,300
Letters of credit for real estate leases	$ 7,800