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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jul. 27, 2018
Feb. 07, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total     $ 47,000 $ 50,900  
Interest Costs Capitalized     0 0  
Repayments of Long-term Debt, Total     $ 3,208 $ 559,433  
2024 Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage     5.125%   5.125%
2026 Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage     5.875%   5.875%
The 2017 Senior Credit Facility [Member]          
Debt Agreement, Maximum Borrowing Capacity     $ 732,000    
Long-term Debt, Gross     632,026   $ 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     4.30%    
Long-term Debt, Gross     $ 632,000    
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | Subsequent Event [Member]          
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%