Leases Components of Leases Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Operating Leases, Rent Expense		$ 33,324
Operating Lease, Cost	$ 18,579
Variable Lease, Cost	13,113
Short-term Lease, Cost	956
Lease, Cost	$ 32,648