Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT (Schedule of Long-Term Debt) (Details)

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LONG-TERM DEBT (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total principal amount $ 2,337,992 $ 2,364,585
Less unamortized discounts and debt issuance costs (38,033) (51,532)
Total long-term debt, net of unamortized discounts and debt issuance costs 2,299,959 2,313,053
Less: current portion 347,593 53,317
Total long-term debt, net 1,952,366 2,259,736
Senior Secured Credit Facility Term loan A [Member]    
Debt Instrument [Line Items]    
Total principal amount 175,750 187,625
Senior Secured Credit Facility Term loan B [Member]    
Debt Instrument [Line Items]    
Total principal amount 962,849 972,563
4.875% Senior Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Total principal amount 575,000 575,000
5.375% Senior Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Total principal amount 250,000 250,000
2.5% Convertible Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Total principal amount 275,000 275,000
Other Long Term Debt [Member]    
Debt Instrument [Line Items]    
Total principal amount $ 99,393 $ 104,397