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BORROWING ARRANGEMENTS (Schedule of refinancing related costs) (Narrative) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 28, 2017
Mar. 11, 2014
Financing Activities and Borrowing Arrangements [Line Items]          
Write off of deferred financing costs and unamortized premiums due to refinancing $ 10,195    
Prepayment and other costs associated with refinancing 11,770    
4.95% notes due 2024          
Financing Activities and Borrowing Arrangements [Line Items]          
Interest rate 4.95% 4.95%      
Omega Credit Facilities 2014 [Member]          
Financing Activities and Borrowing Arrangements [Line Items]          
Write off of deferred financing costs and unamortized premiums due to refinancing     5,500    
Senior Notes [Member] | 4.95% notes due 2024          
Financing Activities and Borrowing Arrangements [Line Items]          
Interest rate 4.95%       4.95%
Long-term Debt, Gross $ 400,000 $ 400,000     $ 400,000
Senior Notes [Member] | 5.875% notes due 2024 [Member]          
Financing Activities and Borrowing Arrangements [Line Items]          
Write off of deferred financing costs and unamortized premiums due to refinancing     $ 4,700    
Interest rate     5.875% 5.875%  
Long-term Debt, Gross       $ 400,000  
Prepayment and other costs associated with refinancing     $ 11,800    
Loan redeemed       $ 400,000