Leases Leases Lease Costs (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) Rate	Jun. 30, 2019 USD ($) Rate
Leases [Abstract]
Lease, Cost	$ 8,412	$ 16,630
Operating Lease, Expense	9,587	19,078
Variable Lease, Cost	746	1,628
Short-term Lease, Cost	$ 429	$ 820
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months 6 days	6 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent | Rate	2.90%	2.90%