Leases Leases Supplemental Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Finance Lease, Liability	$ 56,545
Operating Lease, Liability	71,755
Operating Lease, Right-of-Use Asset	70,834	$ 0
Operating Lease, Liability, Current	4,120	0
Operating Lease, Liability, Noncurrent	67,635	0
Finance Lease, Right-of-Use Asset	53,711	0
Finance Lease, Liability, Current	2,695	0
Finance Lease, Liability, Noncurrent	$ 53,850	$ 0
Operating Lease, Weighted Average Remaining Lease Term	27 years 117 days
Finance Lease, Weighted Average Remaining Lease Term	9 years 233 days
Operating Lease, Weighted Average Discount Rate, Percent	3.82%
Finance Lease, Weighted Average Discount Rate, Percent	4.85%