LONG-TERM DEBT LIABILITIES - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Aggregate Principal Maturities [Line Items]
2018	$ 13,319
2019	13,329
2020	13,317
2021	13,305
2022	156,300
Thereafter	1,663,500
Total		$ 480,087
Credit Facility
Aggregate Principal Maturities [Line Items]
2018	0
2019	0
2020	0
2021	0
2022	143,000
Thereafter	0
Total	143,000
Senior Notes
Aggregate Principal Maturities [Line Items]
2018	0
2019	0
2020	0
2021	0
2022	0
Thereafter	400,000
Total	400,000
LoansPayableMember
Aggregate Principal Maturities [Line Items]
2018	13,300
2019	13,300
2020	13,300
2021	13,300
2022	13,300
Thereafter	1,263,500
Total	1,330,000
Capital Lease Obligations
Aggregate Principal Maturities [Line Items]
2018	19
2019	29
2020	17
2021	5
2022	0
Thereafter	0
Total	$ 70