Leases - Lease Cost and Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash Flow, Operating Activities, Lessee [Abstract]
Cash paid for operating lease liabilities	$ 41,539	$ 39,291
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 18,134	$ 19,823
Weighted average remaining lease term:
Weighted average remaining lease term for operating leases	4 years 7 months 6 days		4 years 9 months 18 days
Operating Leases, Weighted Average Discount Rate, Percent [Abstract]
Weighted average discount rate for operating leases	2.80%		3.00%