Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease costs	$ 11,900	$ 10,865
Short-term lease costs	522	863
Variable lease costs	2,987	3,013
Sublease income	(1,090)	(1,197)
Total lease cost	$ 14,319	$ 13,544