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Note 4 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Apr. 03, 2017
Feb. 07, 2017
Sep. 14, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 16, 2018
Jun. 14, 2016
Long-term Debt, Gross       $ 2,570,026        
Proceeds from Issuance of Long-term Debt, Total       750,000 $ 641,438 $ 1,656,000    
Gain (Loss) on Extinguishment of Debt, Total       (2,851) (31,987)    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total       94,500 97,000 76,200    
Interest Costs Capitalized       $ 0 $ 0 $ 0    
2024 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage       5.125% 5.125%      
Long-term Debt, Gross       $ 525,000        
Unsecured Debt, Total       $ 525,000 $ 525,000      
2026 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage       5.875% 5.875%      
Long-term Debt, Gross       $ 700,000        
Unsecured Debt, Total       $ 700,000 $ 700,000      
Debt Instrument, Face Amount               $ 500,000
2027 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage       7.00%     7.00%  
Long-term Debt, Gross       $ 750,000        
Unsecured Debt, Total       750,000      
Debt Instrument, Face Amount             $ 750,000  
The 2017 Senior Credit Facility [Member]                
Long-term Debt, Gross       595,026 635,234      
Debt Agreement, Maximum Borrowing Capacity       695,000        
Gain (Loss) on Extinguishment of Debt, Total         2,900      
Debt Issuance Costs, Gross         $ 5,000      
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000   $ 100,000        
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.375%            
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.50%            
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread Used to Define Base Rate   1.00%            
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.50%            
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                
Debt Instrument, Basis Spread on Variable Rate   0.50%            
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]                
Debt Instrument, Basis Spread Used to Define Base Rate   0.50%            
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member]                
Debt Instrument, Interest Rate, Stated Percentage       4.60%        
Long-term Debt, Gross   $ 556,400   $ 595,000        
Proceeds from Issuance of Long-term Debt, Total $ 85,000              
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       2.25%        
Debt Instrument, Basis Spread on Variable Rate if Leverage Ratio is Less Than or Equal to 5.25   2.25%            
Debt Instrument, Interest Rate, Applicable Margin, If Leverage Ratio is Greater than 5.25   2.50%            
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | Base Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate       1.25%        
Debt Instrument, Basis Spread on Variable Rate if Leverage Ratio is Less Than or Equal to 5.25   1.25%            
Debt Instrument, Interest Rate, Applicable Margin, If Leverage Ratio is Greater than 5.25   1.50%            
The Additional 2026 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage       5.875%        
Proceeds from Issuance of Long-term Debt, Total     $ 206,000          
Debt Instrument, Face Amount     $ 200,000          
Debt Instrument, Issueing Price, Percentage     103.00%          
Debt Instrument, Interest Rate, Effective Percentage       5.398%