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Debt and Financing Arrangements - Narrative (Details)
3 Months Ended 6 Months Ended
Jan. 21, 2016
USD ($)
Jan. 13, 2016
USD ($)
factor
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jul. 20, 2016
USD ($)
Jan. 11, 2016
Line of Credit Facility [Line Items]                
Securitized accounts receivable   $ 200,000,000            
Number of factors required to determine cost of advance backstopping a letter of credit issued under the securitization facility | factor   2            
Program fees   2.65%            
DIP, amount arranged $ 275,000,000              
DIP, Carve-out for claims 75,000,000              
DIP, prior to entry of final order 300,000,000              
DIP, following the entry of final order 500,000,000              
DIP, customary prepayments, proceeds from sale or disposition of non-ordinary course asset 50,000,000              
DIP, customary prepayments, proceeds from sale or disposition of non-ordinary course asset, individual sale, maximum 7,500,000              
DIP, customary prepayments, proceeds from any casualty event $ 50,000,000              
Interest expense     $ (45,273,000) $ (99,574,000) $ (89,724,000) $ (198,826,000)    
Subsequent Event [Member]                
Line of Credit Facility [Line Items]                
Debt Issuance Costs, Gross             $ 15,600,000  
London Interbank Offered Rate (LIBOR) [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (percent) 9.00%              
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Floor [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (percent) 1.00%              
Base Rate [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate (percent) 8.00%              
7.00% Senior Notes Due 2019 [Member]                
Line of Credit Facility [Line Items]                
Senior notes interest rate (percent)     7.00%   7.00%     7.00%
9.875% Senior Notes Due 2019 [Member]                
Line of Credit Facility [Line Items]                
Senior notes interest rate (percent)     9.875%   9.875%     9.875%
8.00% Senior Secured Notes due 2019 [Member]                
Line of Credit Facility [Line Items]                
Senior notes interest rate (percent)     8.00%   8.00%     8.00%
7.25% Senior Notes Due 2020 [Member]                
Line of Credit Facility [Line Items]                
Senior notes interest rate (percent)     7.25%   7.25%     7.25%
7.25% Senior Notes Due 2021 [Member]                
Line of Credit Facility [Line Items]                
Senior notes interest rate (percent)     7.25%   7.25%     7.25%