v3.8.0.1
DEBT Table 1 - Long-Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs $ (10,492) $ (968)
Total long-term debt 3,613,059 3,014,364
Current portion of long-term debt 349,990 0
Long-term debt, less current portion $ 3,263,069 $ 3,014,364
$1.75 billion revolving credit agreement    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Oct. 29, 2020 Oct. 29, 2019
Total long-term debt $ 893,311 $ 838,992
7.65% senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2018  
Total long-term debt $ 350,000 350,000
4.80% senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Sep. 01, 2020  
Total long-term debt $ 450,000 450,000
6.75% senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Feb. 01, 2021  
Total long-term debt $ 300,000 300,000
4.75% senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Feb. 01, 2022  
Total long-term debt $ 250,000 250,000
5.625% senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Apr. 28, 2027  
Total long-term debt $ 550,000 0
7.625% subordinated notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Jan. 15, 2043  
Total long-term debt $ 402,500 402,500
Gulf Opportunity Zone revenue bonds    
Debt Instrument [Line Items]    
Maturity date range, start Jun. 01, 2038  
Maturity date range, end Aug. 01, 2041  
Total long-term debt $ 365,440 365,440
Amended Receivables Financing Agreement    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Sep. 20, 2020  
Total long-term debt $ 62,300 $ 58,400