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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 27, 2018
Feb. 07, 2017
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total       $ 74,400 $ 77,500  
Interest Costs Capitalized       0 0  
Repayments of Long-term Debt, Total       $ 40,208 $ 561,037  
2024 Notes [Member]            
Debt Instrument, Interest Rate, Stated Percentage       5.125%   5.125%
Unsecured Debt, Total       $ 525,000   $ 525,000
2026 Notes [Member]            
Debt Instrument, Interest Rate, Stated Percentage       5.875%   5.875%
Unsecured Debt, Total       $ 700,000   $ 700,000
The 2017 Senior Credit Facility [Member]            
Debt Agreement, Maximum Borrowing Capacity       695,000    
Long-term Debt, Gross       595,026   $ 635,234
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 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       4.40%    
Long-term Debt, Gross       $ 595,000    
Repayments of Long-term Debt, Total $ 37,000          
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 2018 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 200,000      
Debt Instrument, Term     5 years      
The 2018 Senior Credit Facility [Member] | The 2018 Term Loan [Member] | Scenario, Forecast [Member]            
Long-term Debt, Gross     $ 1,400,000      
2027 Notes [Member] | Scenario, Forecast [Member]            
Debt Instrument, Interest Rate, Stated Percentage     7.00%      
Unsecured Debt, Total     $ 750,000