Leases - Supplemental balance sheet information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lease liabilities	$ 122,221
Cash paid for amounts included in the measurement of lease liabilities within operating cash flows	26,458
Right of use assets obtained in exchange for operating lease obligations	$ 37,673
Weighted average remaining lease term	7 years 2 months 12 days
Weighted average discount rate	4.40%