Leases - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 17,696
2020	33,907
2021	29,460
2022	27,161
2023	22,038
2024 and thereafter	46,185
Total future lease payments	176,447
Less imputed interest	23,961
Present value of future operating lease payments	152,486
Less current portion of operating lease liabilities	29,298
Non-current operating lease liability	123,188
Operating lease right-of-use asset, net	$ 135,189