Leases - Summary of Supplemental Balance Sheet Information related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Operating lease right-of-use assets	$ 62,316	$ 0
Liabilities:
Other current liabilities	15,193	0
Operating lease liabilities	50,550	$ 0
Total operating lease liabilities	$ 65,743
Weighted average remaining operating lease term (years)	6 years 9 months 10 days
Weighted average operating lease discount rate	4.07%