Leases Lease Textuals - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Lease, Expense	$ 39,732	$ 39,190	$ 38,900
Lessee Operating Lease Lease Not Yet Commenced Total Contract Value	15,300
Amortization of Operating Lease Right-of-Use Asset	32,100	31,100
Change in lease liability cash flow	31,700	30,100
Operating Lease, Payments	36,000	33,500
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 35,000	$ 25,700