Operating Leases - Summary of Minimum Future Payments Uder Non-cancelable Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Remainder of 2019	$ 65,058
2020	84,120
2021	79,102
2022	78,288
2023	76,386
Thereafter	485,856
Total undiscounted lease payments	868,810
Non-cancelable Leases [Member]
Lessee Lease Description [Line Items]
Remainder of 2019	25,478
2020	22,099
2021	18,012
2022	10,004
2023	4,889
Thereafter	10,420
Total undiscounted lease payments	$ 90,902