Leases Lessee, Lease Costs and Other Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease costs	$ 3,677
Finance Lease, Amortization of right of use asset	16	[1]
Finance Lease, Interest on lease liabilities	$ 12	[2]
Operating Lease, Weighted Average Remaining Lease Term	52 years
Finance Lease, Weighted Average Remaining Lease Term	5 years
Operating Lease, Weighted Average Discount Rate, Percent	5.70%
Finance Lease, Weighted Average Discount Rate, Percent	4.10%

[1] The finance leases relate to either land, building or assets that remain in development. The Company's policy is not to depreciate finance lease assets related to land because it is assumed to have an indefinite life. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company's policy.

[2] Three of the finance leases relate to assets under development and as such the entire interest amount was capitalized.