Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease cost	$ 46,934
Amortization of right-of-use assets	1,023	$ 1,000	$ 1,000
Interest on lease liabilities	354
Total finance lease cost	1,377
Short-term lease cost	1,953
Total lease cost	50,264
Operating cash flows for operating leases	48,833
Operating cash flows for finance leases	323
Financing activities for finance leases	1,610
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 12,223
Operating leases	7 years 3 months 18 days
Finance leases	2 years 8 months 12 days
Operating leases	4.75%
Finance leases	8.27%