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Note 7 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 03, 2019
Jun. 25, 2018
Mar. 28, 2016
Dec. 31, 2019
Dec. 31, 2018
Aug. 02, 2018
Dec. 31, 2017
Long-term Line of Credit, Total       $ 1,305,634 $ 1,771,330    
Long-term Debt, Total       $ 3,765,931 3,979,300    
Debt Instrument, Fixed Quarterly Amortization of Principal Percentage       5.00%      
Debt Instrument Prepayment Fee, Percentage       1.00%      
Long-term Debt, Gross       $ 3,813,956 $ 4,030,035    
Senior Notes 6.875% Due 2023 [Member]              
Debt Instrument, Interest Rate, Stated Percentage       6.875% 6.875%   6.875%
Bank Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity       $ 945,500      
Long-term Line of Credit, Total       1,300,000      
Long-term Debt, Total       41,300      
Letters of Credit Outstanding, Amount       12,600      
Line of Credit Facility, Remaining Borrowing Capacity       $ 656,600      
Bank Credit Facility [Member] | Eurodollar [Member]              
Debt Instrument, Basis Spread on Variable Rate       1.00%      
Bank Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate       0.50%      
Bank Credit Facility [Member] | Term Loan A, Joinder Agreement [Member]              
Long-term Line of Credit, Additional Available Borrowing Capacity           $ 49,500  
Long-term Line of Credit, Total           234,300  
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member]              
Long-term Debt, Total       $ 984,416      
Debt Instrument, Face Amount $ 1,000,000            
Debt Instrument, Interest Rate, Stated Percentage 4.75%     4.75% 4.75%    
Debt Issuance Costs, Gross $ 15,700            
Debt Instrument, Conditional Repurchase Price Percent of Principal 101.00%            
Debt Instrument, Additional Interest Accrued After Covenants 0.25%            
Debt Instrument, Contingent Liability $ 0            
Long-term Debt, Gross       $ 1,000,000      
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Prior to December 1, 2022 [Member]              
Debt Instrument, Redemption Price, Percentage 100.00%            
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] | In 2022 [Member]              
Debt Instrument, Redemption Price, Percentage 102.375%            
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] | In 2024 [Member]              
Debt Instrument, Redemption Price, Percentage 100.00%            
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Maximum [Member]              
Debt Instrument, Additional Interest Accrued After Covenants 1.00%            
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]              
Long-term Debt, Total       $ 690,756 $ 689,361    
Debt Instrument, Face Amount   $ 700,000          
Debt Instrument, Interest Rate, Stated Percentage   6.00%   6.00% 6.00%    
Debt Issuance Costs, Gross   $ 11,300          
Debt Instrument, Conditional Repurchase Price Percent of Principal   101.00%          
Long-term Debt, Gross       $ 700,000 $ 700,000    
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member] | In 2024 [Member]              
Debt Instrument, Redemption Price, Percentage   100.00%          
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member] | Prior to August 15, 2021 [Member]              
Debt Instrument, Redemption Price, Percentage   100.00%          
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member] | In 2021 [Member]              
Debt Instrument, Redemption Price, Percentage   103.00%          
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]              
Long-term Debt, Total       $ 741,729 $ 740,406    
Debt Instrument, Face Amount     $ 750,000        
Debt Instrument, Interest Rate, Stated Percentage     6.375% 6.375% 6.375%    
Debt Issuance Costs, Gross     $ 13,000        
Debt Instrument, Conditional Repurchase Price Percent of Principal     101.00%        
Long-term Debt, Gross       $ 750,000 $ 750,000    
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member] | In 2024 [Member]              
Debt Instrument, Redemption Price, Percentage     100.00%        
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member] | In 2021 [Member]              
Debt Instrument, Redemption Price, Percentage     103.188%        
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member] | Prior to April 1, 2021 [Member]              
Debt Instrument, Redemption Price, Percentage     100.00%        
Senior Notes [Member] | Senior Notes 6.875% Due 2023 [Member]              
Long-term Debt, Total         $ 742,299    
Debt Instrument, Interest Rate, Stated Percentage 6.875%       6.875%    
Debt Instrument, Redemption Price, Percentage 103.438%            
Long-term Debt, Gross         $ 750,000    
Notes Payable, Other Payables [Member]              
Long-term Debt, Gross       $ 57,700      
Line of Credit Facility, Interest Rate at Period End       11.20% 11.11%    
Senior Secured Notes [Member]              
Debt Instrument Covenant Terms, Minimum Required Coverage Ratio       2.0      
Revolving Credit Facility [Member]              
Line of Credit Facility, Additional Available Borrowing Capacity           170,500  
Line of Credit Facility, Maximum Borrowing Capacity           $ 945,500  
Line of Credit Facility Covenant Terms, Maximum Secured Leverage Ratio Allowed       4.25      
Line of Credit Facility Covenant Terms, Minimum Consolidated Interest Coverage Ratio Required       1.75      
Revolving Credit Facility [Member] | Bank Credit Facility [Member]              
Long-term Line of Credit, Total       $ 235,000      
Revolving Credit Facility [Member] | Bank Credit Facility [Member] | Minimum [Member]              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.25%      
Revolving Credit Facility [Member] | Bank Credit Facility [Member] | Maximum [Member]              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.50%      
Revolving Credit Facility, Swing Loan and Term Loan A [Member] | Eurodollar [Member] | Minimum [Member]              
Debt Instrument, Basis Spread on Variable Rate       1.75%      
Revolving Credit Facility, Swing Loan and Term Loan A [Member] | Eurodollar [Member] | Maximum [Member]              
Debt Instrument, Basis Spread on Variable Rate       2.75%      
Revolving Credit Facility, Swing Loan and Term Loan A [Member] | Base Rate [Member] | Minimum [Member]              
Debt Instrument, Basis Spread on Variable Rate       0.75%      
Revolving Credit Facility, Swing Loan and Term Loan A [Member] | Base Rate [Member] | Maximum [Member]              
Debt Instrument, Basis Spread on Variable Rate       1.75%      
Refinancing Term B Loans [Member] | Eurodollar [Member] | Minimum [Member]              
Debt Instrument, Basis Spread on Variable Rate       2.25%      
Refinancing Term B Loans [Member] | Eurodollar [Member] | Maximum [Member]              
Debt Instrument, Basis Spread on Variable Rate       2.50%      
Refinancing Term B Loans [Member] | Base Rate [Member] | Minimum [Member]              
Debt Instrument, Basis Spread on Variable Rate       1.25%      
Refinancing Term B Loans [Member] | Base Rate [Member] | Maximum [Member]              
Debt Instrument, Basis Spread on Variable Rate       1.50%      
Amended Credit Facility [Member] | Revolving Credit Facility, Swing Loan and Term Loan A [Member]              
Line of Credit Facility, Additional Available Borrowing Capacity       $ 550,000