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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2016-02 and ASU 2018-02 (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 82,099 $ 83,222
Prepaid and other $ 118,245 122,104 116,862
Property, plant and equipment 991,613 1,007,130 997,489
Current maturities of long-term obligations, net of unamortized debt issuance costs 62,678 63,981 65,309
Accounts payable and accrued liabilities 525,199 542,252 545,707
Operating lease liabilities   64,592 61,331
Long-term obligations, net of unamortized debt issuance costs 1,125,993 $ 1,141,062 1,129,238
Reclassification of stranded income tax effects from AOCI to retained earnings $ 6,700    
Accounting Standards Update 2016-02 | Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets     83,222
Prepaid and other     (1,383)
Property, plant and equipment     5,876
Current maturities of long-term obligations, net of unamortized debt issuance costs     2,631
Accounts payable and accrued liabilities     20,508
Operating lease liabilities     61,331
Long-term obligations, net of unamortized debt issuance costs     $ 3,245