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Long-Term Debt Senior Secured Second Lien Notes (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Rate
Jul. 01, 2012
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt $ 0 $ 150,000,000
Debt Instrument, Interest Rate, Stated Percentage 11.25%  
Senior Notes, Redemption Price, Year Three 105.625%  
Senior Notes, Redemption Price, Year Four 102.813%  
Senior Notes, Redemption Price, Year Five 100.00%  
Senior Notes, Redemption Price, Year One and Two 100.00%  
Senior Notes, Amount Redeemable with Proceeds from Equity Offerings 35.00%  
Collateral exclusion for material subsidiaries, percentage of Senior Notes 20.00%  
Senior Notes, Cross Default Provision, Minimum Debt Principal Amount 15,000,000  
Repayment of Debt [Member]
   
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt   64,800,000
Net acquisition payments [Member]
   
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt   12,100,000
Payment of financing costs [Member]
   
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt   4,500,000
Cash collateral funding [Member]
   
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt   20,000,000
Remainder of debt proceeds [Member]
   
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt   $ 48,600,000