Leases - Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases
Operating lease cost	$ 24,890
Short-term lease cost	6,925
Variable lease cost	5,979
Total lease cost	37,794
Cash paid for amounts included in the measurement of lease liability operating cash flows	24,140
ROU assets obtained in exchange for lease liabilities	$ 4,808
Weighted-average remaining lease term (in years)	19 years 5 months 23 days
Weighted-average discount rate	6.90%