DEBT - Schedule of Maturities for Outstanding Debt (Details) $ in Thousands	Aug. 17, 2017 extension_option	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
April 1 through December 31, 2019		$ 2,584
2020		203,541
2021		1,138,446
2022		996,810
2023		203,282
Thereafter		685,916
Total Debt		3,230,579
Premium, net		14,135
Deferred financing costs, net		(14,484)
Total Debt, Net		3,230,230
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]
April 1 through December 31, 2019		2,584
2020		3,541
2021		18,446
2022		3,185
2023		3,282
Thereafter		85,916
Total Debt		116,954
Premium, net		0
Deferred financing costs, net		(1,766)	$ (1,800)
Total Debt, Net		115,188
Revolving Credit Facility
Debt Instrument [Line Items]
April 1 through December 31, 2019		0
2020		0
2021		620,000
2022		0
2023		0
Thereafter		0
Total Debt		620,000
Premium, net		0
Deferred financing costs, net		0
Total Debt, Net		620,000
Term Loans
Debt Instrument [Line Items]
April 1 through December 31, 2019		0
2020		200,000
2021		0
2022		993,625
2023		0
Thereafter		0
Total Debt		1,193,625
Premium, net		0
Deferred financing costs, net		(6,241)
Total Debt, Net		1,187,384
Senior Notes
Debt Instrument [Line Items]
April 1 through December 31, 2019		0
2020		0
2021		500,000
2022		0
2023		200,000
Thereafter		600,000
Total Debt		1,300,000
Premium, net		14,135	14,500
Deferred financing costs, net		(6,477)	$ (7,100)
Total Debt, Net		$ 1,307,658