LEASES (Maturity Analysis on an Undiscounted Basis) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019 (remainder)	$ 39,281,000
2020	49,300,000
2021	45,607,000
2022	40,680,000
2023	36,143,000
Thereafter	605,516,000
Total minimum lease payments	816,527,000
Less: Lease payments representing interest	381,846,000
Present value of future minimum lease payments	434,681,000
Current obligations under leases	31,255,000
Long-term lease obligations	$ 403,426,000	$ 0	$ 0