Leases Lease Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Lease, Cost	$ 33,666
Variable Lease, Cost	4,337
Short-term Lease, Cost	1,187
Operating Lease, Expense	$ 39,190	$ 38,900	$ 36,900
Operating Lease, Weighted Average Remaining Lease Term	6 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	2.90%