Leased Properties - Future Lease Payments (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
October 1, 2019 through December 31, 2019	$ 77,339
2020	296,219
2021	230,421
2022	173,932
2023	122,529
Thereafter	276,067
Total undiscounted future minimum lease payments	1,176,507
Less: Difference between undiscounted lease payments and discounted operating lease liabilities	104,654
Total operating lease liabilities	$ 1,071,853