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Note 8 - Long-term Debt (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended 26 Months Ended
Apr. 23, 2018
USD ($)
May 01, 2017
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Apr. 22, 2018
Jun. 30, 2020
Dec. 31, 2017
USD ($)
Jun. 17, 2015
USD ($)
Debt Issuance Costs, Net, Total       $ 18,615       $ 19,585  
Amortization of Debt Issuance Costs       970 $ 400        
Secured Debt [Member]                  
Debt Instrument, Face Amount   $ 750,000              
Optional Additional Available Credit Facilities   $ 425,000              
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio   1.8              
Secured Debt [Member] | Incremental Term Loan A [Member]                  
Debt Instrument, Face Amount   $ 250,000              
Debt Instrument, Term   5 years              
Long-term Debt, Gross       $ 245,300          
Long Term Debt, Amortization Rate, First Twelve Months   2.50%              
Long Term Debt, Amortization Rate, Year Two   5.00%              
Long Term Debt, Amortization Rate, Year Three   7.50%              
Long Term Debt, Amortization Rate, Year Four   10.00%              
Debt Instrument, Interest Rate, Effective Percentage       4.06%          
Secured Debt [Member] | Incremental Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument, Basis Spread on Variable Rate   1.50%              
Secured Debt [Member] | Incremental Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument, Basis Spread on Variable Rate   2.25%              
Secured Debt [Member] | Incremental Term Loan A [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument, Basis Spread on Variable Rate   0.50%              
Secured Debt [Member] | Incremental Term Loan A [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument, Basis Spread on Variable Rate   1.25%              
Secured Debt [Member] | Incremental Term Loan B [Member]                  
Debt Instrument, Face Amount   $ 500,000              
Debt Instrument, Term   7 years              
Long-term Debt, Gross       $ 496,300          
Debt Instrument, Amortization Percent on a Quarterly Basis   1.00%              
Debt Instrument, Prepayment Penalty, Prepaid within Six Months, Percent   1.00%              
Debt Instrument, Interest Rate, Effective Percentage       4.56%          
Secured Debt [Member] | Incremental Term Loan B [Member] | Subsequent Event [Member]                  
Debt Issuance Costs, Net, Total $ 2,000                
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member]                  
Debt Instrument, Basis Spread on Variable Rate             1.75%    
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]                  
Debt Instrument, Basis Spread on Variable Rate 1.75%         2.25%      
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | Scenario, Forecast [Member]                  
Debt Instrument, Basis Spread on Variable Rate             0.75%    
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | Subsequent Event [Member]                  
Debt Instrument, Basis Spread on Variable Rate 0.75%         1.25%      
Senior Unsecured Notes Due 2022 [Member]                  
Debt Instrument, Face Amount                 $ 450,000
Debt Instrument, Interest Rate, Stated Percentage                 5.75%
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member]                  
Letters of Credit Outstanding, Amount       $ 3,100          
Senior Credit Facilities Due 2020 [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member]                  
Debt Instrument, Term     5 years            
Debt Issuance Costs, Net, Total $ 200,000                
Senior Credit Facilities Due 2020 [Member] | Secured Debt [Member] | JPMorgan Chase Bank [Member]                  
Debt Instrument, Term     5 years            
Long-term Debt, Gross     $ 100,000            
Senior Credit Facilities Due 2020 [Member] | Letter of Credit [Member] | JPMorgan Chase Bank [Member]                  
Line of Credit Facility, Remaining Borrowing Capacity       $ 196,900