Leases - Net lease cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 14,844
Short-term lease cost	19
Variable lease cost	3,918
Sublease income	(126)
Net lease cost	18,656
Operating cash flows from operating leases	14,711
Non-cash changes in ROU assets	98,369
Non-cash changes in lease liabilities	108,189
Right-of-use asset obtained in exchange for finance lease liability	$ 87,900