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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Apr. 07, 2017
Dec. 31, 2016
LONG-TERM DEBT      
Total debt $ 1,371,851   $ 1,202,686
Less: current portion     129,896
Long-term debt 1,371,851   1,072,790
Credit Facility      
LONG-TERM DEBT      
Total debt (6,181)   (6,416)
Outstanding borrowings 0   0
Letters of credit      
LONG-TERM DEBT      
Total debt 800    
2017 Notes      
LONG-TERM DEBT      
Total debt 297,784    
2016 Notes      
LONG-TERM DEBT      
Total debt 348,002   347,716
2015 Note      
LONG-TERM DEBT      
Total debt 49,495   49,429
2012 Notes      
LONG-TERM DEBT      
Total debt 199,063   198,894
2010 Notes      
LONG-TERM DEBT      
Total debt $ 483,688   598,167
Outstanding borrowings   $ 485,000  
Other attributable debt instruments      
LONG-TERM DEBT      
Total debt     $ 14,896