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DEBT Senior Notes (Details) - USD ($)
3 Months Ended
Sep. 26, 2017
Mar. 31, 2019
Mar. 31, 2018
Debt Instrument [Line Items]      
Interest expense   $ 7,090,000 $ 7,454,000
Senior notes due 2025      
Debt Instrument [Line Items]      
Notes issued, aggregate principal amount $ 325,000,000    
Notes issued, interest rate 5.50%    
Proceeds from issuance of senior long-term debt $ 318,900,000    
Debt instrument, redemption price, percentage   101.00%  
Debt instrument, redemption price, percentage of principal amount outstanding   60.00%  
Interest expense   $ 4,600,000 $ 4,600,000
Senior notes due 2025 | Debt Instrument, Redemption, Period One      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage   100.00%  
Debt instrument, redemption price, percentage of principal amount redeemed, threshold   40.00%  
Debt instrument, redemption price, percentage for first threshold   105.50%  
Senior notes due 2025 | Debt Instrument, Redemption, Period Two      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage   102.75%  
Senior notes due 2025 | Debt Instrument, Redemption, Period Three      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage   101.375%  
Senior notes due 2025 | Debt Instrument, Redemption, Period Four      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage   100.00%