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LONG-TERM DEBT / INTEREST EXPENSE - Schedule of Long-Term Debt (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Debt Instrument          
Net carrying amount $ 888,353,000 $ 1,152,322,000      
Unpaid original issuance discount 0 11,445,000   $ 19,587,000  
Debt issuance costs (654,000) (762,000)      
Less: current debt 0 (158,756,000)      
Long-term debt 888,353,000 993,566,000      
FILO Term Loan | Term Loan | FILO Asset-based Term Loan Facility          
Debt Instrument          
Origination issuance discount (OID) 10,200,000 10,900,000      
Net carrying amount 264,768,000 264,086,000      
FILO Term Loan | Revolving Credit Facility          
Debt Instrument          
Net carrying amount 0        
Convertible Senior Notes | Notes          
Debt Instrument          
Origination issuance discount (OID) 9,788,000 11,489,000      
Net carrying amount 177,440,000 175,504,000      
Tranche B-1 | Term Loan Facility | Term Loan Facility Due March 2019          
Debt Instrument          
Net carrying amount 0 147,289,000      
Tranche B-2 | Term Loan Facility | Amended Term Loan Facility Due March 2021          
Debt Instrument          
Origination issuance discount (OID) 11,400,000 17,500,000      
Net carrying amount $ 446,799,000 $ 554,760,000 $ 100,000,000   $ 446,800,000