DEBT - Schedule of Maturities for Outstanding Debt (Details) $ in Thousands	Aug. 17, 2017 extension_option	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
October 1 through December 31, 2018		$ 1,085
2019		102,930
2020		204,578
2021		1,139,039
2022		1,001,173
Thereafter		922,595
Total Debt		3,371,400
Premium, net		14,860
Deferred financing costs, net		(17,666)
Total Debt, Net		3,368,594
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Number of extension options | extension_option	2
Extension period	6 months
Secured Indebtedness
Debt Instrument [Line Items]
October 1 through December 31, 2018		1,085
2019		102,930
2020		4,578
2021		20,039
2022		4,285
Thereafter		122,595
Total Debt		255,512
Premium, net		0
Deferred financing costs, net		(2,685)	$ (2,800)
Total Debt, Net		252,827
Revolving Credit Facility
Debt Instrument [Line Items]
October 1 through December 31, 2018		0
2019		0
2020		0
2021		619,000
2022		0
Thereafter		0
Total Debt		619,000
Premium, net		0
Deferred financing costs, net		0
Total Debt, Net		619,000
Term Loans
Debt Instrument [Line Items]
October 1 through December 31, 2018		0
2019		0
2020		200,000
2021		0
2022		996,888
Thereafter		0
Total Debt		1,196,888
Premium, net		0
Deferred financing costs, net		(7,241)
Total Debt, Net		1,189,647
Senior Notes
Debt Instrument [Line Items]
October 1 through December 31, 2018		0
2019		0
2020		0
2021		500,000
2022		0
Thereafter		800,000
Total Debt		1,300,000
Premium, net		14,860	15,900
Deferred financing costs, net		(7,740)	$ (9,600)
Total Debt, Net		$ 1,307,120