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Note 6 - Debt And Capital Leases (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Sep. 03, 2013
USD ($)
Mar. 31, 2018
USD ($)
Subsidiary
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt And Capital Leases [Line Items]              
Percentage of Stock of Material Domestic Subsidiaries Securing Credit Agreement     100.00% 100.00%      
Percentage of Stock of Material First Tier Foreign Subsidiaries Securing Credit Agreement     65.00% 65.00%      
Term Credit Agreements, U.S. Liquidity, Threshold Below which No Prepayment is Required       $ 100,000,000      
Term Credit Agreements, Prepayments Required in Next Fiscal Year $ 0            
Term Credit Agreements, First Lien Term Credit Agreement, Maximum Secured Leverage Ratio     2.75 2.75      
Number of subsidiaries designated as unrestricted subsidiaries | Subsidiary     5        
Aggregate sales of designated subsidiaries       $ 357,000,000 $ 357,000,000    
Aggregate assets of designated subsidiaries     $ 1,672,000,000 $ 1,672,000,000   $ 1,707,000,000  
Percentage of aggregate sales of unrestricted subsidiaries to consolidated sales of entity     0.00% 0.00%      
Percentage of aggregate assets of unrestricted subsidiaries to consolidated assets of entity     1.00% 1.00%      
Unrestricted Subsidiaries [Member]              
Debt And Capital Leases [Line Items]              
Aggregate sales of designated subsidiaries       $ 2,000,000      
Aggregate assets of designated subsidiaries     $ 23,000,000 23,000,000      
Amended Credit Agreement [Member]              
Debt And Capital Leases [Line Items]              
Excess Availability Amount     36,000,000 36,000,000   20,000,000  
Line of Credit Facility, Maximum Borrowing Capacity     150,000,000 150,000,000      
Long-term Line of Credit     $ 79,000,000 $ 79,000,000   96,000,000  
Fixed Charged Coverage Ratio Required     1.00 1.00      
Excess Availability Below Which the Fixed Charge Coverage Ratio is Triggered     1250.00% 1250.00%      
Lender Commitments, Threshold Trigger, Excess Availability Amount     $ 18,750,000 $ 18,750,000   18,750,000  
Excess Availability Percentage of Lender Commitments Threshold Triggering Cash Dominion Control     1250.00% 1250.00%      
Amended Credit Agreement [Member] | Period one [Member]              
Debt And Capital Leases [Line Items]              
Line of Credit Facility, Expiration Date       May 26, 2021      
Amended Credit Agreement [Member] | Period two [Member]              
Debt And Capital Leases [Line Items]              
Number of days prior to the earliest scheduled maturity date       90 days      
Earliest maturity date       Sep. 03, 2019      
Prior Credit Agreement [Member]              
Debt And Capital Leases [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 200,000,000 $ 200,000,000      
Amended Credit Facility [Member]              
Debt And Capital Leases [Line Items]              
Excess Availability, Calculation, Percentage of Eligible Receivables Less a Dilution Reserve     85.00% 85.00%      
Excess Availability, Calculation, Percentage of Net Orderly Liquidation Value     85.00% 85.00%      
Excess Availability, Calculation, Percentage of Eligible Inventory     75.00% 75.00%      
Excess Availability, Net Orderly Liquidation Equipment Amount     $ 14,000,000 $ 14,000,000      
Excess Availability, Calculation, Percentage of Eligible Equipment     75.00% 75.00%      
Decrease in excess availability net orderly liquidation equipment amount     $ 1,000,000 $ 1,000,000      
Maximum [Member]              
Debt And Capital Leases [Line Items]              
Secured leverage ratio       2.25%      
Maximum [Member] | Amended Credit Agreement [Member]              
Debt And Capital Leases [Line Items]              
Percentage of aggregate consolidated sales to qualify Restricted Subsidiaries to be designated as Unrestricted Subsidiaries       7.50%      
Percentage of aggregate consolidated assets to qualify Restricted Subsidiaries to be designated as Unrestricted Subsidiaries       7.50%      
Maximum [Member] | Amended Credit Facility [Member] | London Interbank Offered Rate (LIBOR)              
Debt And Capital Leases [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       2.75%      
Maximum [Member] | Amended Credit Facility [Member] | Base Rate              
Debt And Capital Leases [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       1.75%      
Minimum [Member] | Amended Credit Agreement [Member]              
Debt And Capital Leases [Line Items]              
Proforma fixed charge coverage ratio       1.00%      
Minimum [Member] | Amended Credit Agreement [Member] | Pro Forma              
Debt And Capital Leases [Line Items]              
Excess Availability Amount     $ 30,000,000 $ 30,000,000      
Minimum [Member] | Amended Credit Facility [Member] | London Interbank Offered Rate (LIBOR)              
Debt And Capital Leases [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       2.25%      
Minimum [Member] | Amended Credit Facility [Member] | Base Rate              
Debt And Capital Leases [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       1.25%      
First Lien Term Loan [Member]              
Debt And Capital Leases [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       6.25%      
LIBOR Floor Percentage     1.00% 1.00%      
Alternate Base Rate     5.25% 5.25%      
Prepayment of principal amount           $ 11,000,000 $ 11,000,000
First installment principal payments     $ 4,000,000 $ 4,000,000      
Term Credit Agreement [Member]              
Debt And Capital Leases [Line Items]              
Debt Instrument Face Amount   $ 695,000,000          
Proceeds from Issuance of Other Long-term Debt   664,000,000          
Debt Instrument Unamortized Discount   15,000,000          
Debt Issuance Cost   16,000,000          
First Lien Term Loan [Member]              
Debt And Capital Leases [Line Items]              
Debt Instrument Face Amount   $ 420,000,000          
Debt Instrument, Maturity Date, Description       The loans made under the First Lien Term Credit Agreement become due on the earlier to occur of      
Debt Instrument, Maturity Date   Sep. 03, 2019          
Second Lien Note Holders [Member]              
Debt And Capital Leases [Line Items]              
Debt Instrument Face Amount   $ 275,000,000          
Debt Instrument, Termination Date   Nov. 15, 2016