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Note 10 - Credit Agreement (Details Textual)
$ in Thousands
6 Months Ended
Dec. 19, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 18, 2017
USD ($)
Amortization of Debt Issuance Costs   $ 282 $ 1,042    
Credit Agreement [Member]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 500,000
Line of Credit Facility, Expiration Period 5 years        
Debt Agreement, Maximum Borrowing Capacity $ 120,000        
Debt Agreement, Maximum Borrowing Capacity, Percent of Consolidated EBITDA 100.00%        
Credit Agreement [Member] | Letter of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 50,000        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.125%        
Credit Agreement [Member] | Swingline Loans [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000        
Credit Agreement [Member] | Revolving Credit Facility [Member]          
Long-term Line of Credit, Total   240,000   $ 240,000  
Repayments of Long-term Lines of Credit   0      
Debt Instrument, Secured Leverage Ratio 5.25        
Debt Issuance Costs, Net, Total   2,500   $ 2,800  
Amortization of Debt Issuance Costs   $ 300 $ 1,000    
Credit Agreement [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]          
Debt Instrument, Covenant, Interest Coverage Ratio 3        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | One-month LIBOR Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.50%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%        
Debt Instrument, Secured Leverage Ratio 3        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Through December 2019 [Member]          
Debt Instrument, Secured Leverage Ratio 4.75        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | From and After January 2020 [Member]          
Debt Instrument, Secured Leverage Ratio 4.25        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | One-month LIBOR Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.00%