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REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Adoption Impact of 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 399,694	$ 378,056	$ 372,445	$ 347,826	$ 374,137	$ 380,142	$ 389,256	$ 376,727	$ 1,498,021	$ 1,520,262	$ 1,444,772
Operating income (loss)	124,056	99,972	93,283	73,605	86,683	89,165	76,387	83,493	390,916	335,728	290,510
Net income from continuing operations	$ 78,408	$ 52,588	$ 46,915	$ 28,923	$ 42,570	$ 43,663	$ 26,909	$ 33,233	$ 206,834	$ 146,375	$ 110,895
Basic net income (loss) per common unit from continuing operations	$ 0.40	$ 0.15	$ 0.11	$ (0.06)	$ 0.07	$ (3.53)	$ 0.12	$ 0.18	$ 0.60	$ (3.34)	$ 0.23
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues										$ 1,526,447
Operating income (loss)										341,913
Net income from continuing operations										$ 152,560
Basic net income (loss) per common unit from continuing operations										$ (3.27)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues										$ (6,185)
Operating income (loss)										(6,185)
Net income from continuing operations										$ (6,185)
Basic net income (loss) per common unit from continuing operations										$ (0.07)