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Long-term Debt - Narrative (Details)
6 Months Ended
Apr. 28, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
May 31, 2013
USD ($)
Debt Instrument [Line Items]          
Aggregate principal amount of debt   $ 165,501,000   $ 182,992,000  
Principal purchased for cash   4,786,000 $ 3,560,000    
Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member]          
Debt Instrument [Line Items]          
Maximum amount of certain indebtedness   40,000,000      
Increase in applicable margin due to amendment to Credit Facility 0.50%        
Current borrowing capacity   26,900,000      
Indebtedness under the Credit Facility   15,000,000      
Number of days prior to stated maturity borrowing capacity reduced by reserve 90 days        
Maximum amount of certain permitted junior indebtedness $ 200,000,000 175,000,000      
Number of days early commitment termination date and early maturity date, eliminated by amendment 90 days        
Limit for multi-client liquidation component   15,000,000.0      
Required liquidity maintained five consecutive business days   7,500,000.0      
Required liquidity maintained any business day   6,500,000.0      
Excess availability to borrow   $ 11,900,000      
Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member] | Conversion Of Third Lien Notes For Second Lien Notes [Member]          
Debt Instrument [Line Items]          
Debt exchange conversion ratio 1        
Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member] | Debt Conversion, Prior To Extended Early Tender Deadline [Member]          
Debt Instrument [Line Items]          
Debt exchange, ratio of principal to common stock shares (in dollars per share) | $ / shares $ 100        
Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member] | Debt Conversion, After Extended Early Tender Deadline [Member]          
Debt Instrument [Line Items]          
Debt exchange, ratio of principal to common stock shares (in dollars per share) | $ / shares $ 142.86        
Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Fixed charge coverage ratio   1.1      
Senior notes [Member]          
Debt Instrument [Line Items]          
Stated rate on debt   8.125%      
Senior secured third-priority notes (maturing May 15, 2018) [Member] | Senior notes [Member]          
Debt Instrument [Line Items]          
Principal amount of debt         $ 175,000,000
Stated rate on debt         8.125%
Aggregate principal amount of debt $ 28,500,000 $ 28,497,000   175,000,000  
Principal purchased for cash 15,000,000        
Amount of debt converted $ 146,500,000        
Percentage of original debt accepted In exchange of outstanding principal of new debt 83.72%        
Amount of debt purchased $ 25,900,000        
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member]          
Debt Instrument [Line Items]          
Stated rate on debt 9.125%        
Aggregate principal amount of debt $ 120,600,000 $ 120,569,000   $ 0  
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member] | Conversion Of Common Stock For Second Lien Notes [Member]          
Debt Instrument [Line Items]          
Debt converted for shares, issued shares | shares 1,205,477        
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member] | Early Stock Consideration [Member]          
Debt Instrument [Line Items]          
Debt converted for shares, issued shares | shares 1,204,980        
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member] | Stock Consideration [Member]          
Debt Instrument [Line Items]          
Debt converted for shares, issued shares | shares 497        
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member] | Treasury Stock [Member] | Conversion Of Common Stock For Second Lien Notes [Member]          
Debt Instrument [Line Items]          
Debt converted for shares, issued shares | shares 508,464        
Base Rate [Member] | Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate for debt 3.00% 2.50%      
London Interbank Offered Rate (LIBOR) [Member] | Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate for debt 4.00% 3.50%      
Subsidiary Issuer [Member] | Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member]          
Debt Instrument [Line Items]          
Percentage of obligations secured by stock of Subsidiary Borrowers 100.00%        
ION International Holdings L.P. [Member] | Line of credit [Member] | Revolving line of credit [Member] | PNC Bank, National Association (PNC) [Member]          
Debt Instrument [Line Items]          
Percentage of obligations secured by stock of Subsidiary Borrowers 65.00%