Leases Lease Cost (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lease, Cost [Abstract]
Operating Lease, Cost	$ 7,512	$ 22,384
Variable Lease, Cost	1,292	3,613
Sublease Income	(142)	(437)
Lease, Cost	8,662	25,560
Operating Lease, Payments	7,938	23,349
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 9,983	$ 22,917
Operating Lease, Weighted Average Remaining Lease Term	8 years 6 months	8 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.31%	3.31%