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CREDIT FACILITY AND LONG-TERM DEBT (Summary of Long-Term Debt) (Details) - USD ($)	Dec. 31, 2016	Nov. 24, 2016	Dec. 31, 2015	Nov. 24, 2015	Feb. 09, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,576,559,000		$ 1,236,720,000
Long term loan	1,601,836,000		1,268,937,000
Unamortized deferred financing costs	25,277,000		32,217,000
Less—Current maturities	0		0
Total long-term debt	1,576,559,000		1,236,720,000
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Annual interest rate					8.25%
Long-term debt	670,867,000		669,644,000
Long term loan			669,644,000
2023 Senior Secured Notes [Member]
Debt Instrument [Line Items]
Annual interest rate		0.25%		7.00%
Long-term debt	500,000,000		500,000,000
Long term loan			500,000,000
Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	350,000,000		0
Line of Credit [Member] \| Rail Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	0		67,491,000
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long term loan	35,000,000		0
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term debt	$ 45,969,000		$ 31,802,000