LEASES - Maturities of Operating and Financing Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating Leases
2019	$ 50,592
2020	51,533
2021	52,553
2022	53,593
2023	53,897
After 2023	214,168
Total lease payments	476,336
Less: Interest	(151,445)
Present value of lease liabilities	324,891
2019		$ 48,701
2020		49,595
2021		50,570
2022		51,587
2023		52,624
After 2023		245,225
Total lease payments		498,302
Finance Leases
2019	313
2020	243
2021	206
2022	65
2023	27
After 2023	0
Total lease payments	854
Less: Interest	(73)
Present value of lease liabilities	781
2018		454
2019		174
2020		173
2021		127
2022		0
After 2022		0
Total lease payments		928
Operating and Finance Lease Liabilities, Payments, Due [Abstract]
2019	50,905	49,155
2020	51,776	49,769
2021	52,759	50,743
2022	53,658	51,714
2023	53,924	52,624
After 2023	214,168	245,225
Total lease payments	477,190	$ 499,230
Less: Interest	(151,518)
Present value of lease liabilities	$ 325,672