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LONG-TERM DEBT - Additional Information (Details) - USD ($)
Feb. 29, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Standby and trade letters of credit for various corporate purposes   $ 8,300,000 $ 8,800,000
Amended Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Repayment of debt $ 23,200,000    
Percentage of excess cash flow, as defined 50.00%    
2011 Term Loan due 2017 [Member]      
Debt Instrument [Line Items]      
Repayment of debt $ 11,500,000    
Aggregate principal amount outstanding 651,400,000 651,400,000  
Maximum borrowings available under credit facility   675,000,000.0  
Acquisition Term Loan due 2019 [Member]      
Debt Instrument [Line Items]      
Repayment of debt 11,700,000    
Aggregate principal amount outstanding   658,600,000  
Scheduled principal payments $ 6,800,000   $ 6,900,000
Maximum borrowings available under credit facility   700,000,000.0  
Amended Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowings available under credit facility   175,000,000  
Standby and trade letters of credit for various corporate purposes   8,300,000  
Remaining borrowing capacity   166,700,000  
5 3/4% Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Maximum borrowings available under credit facility   $ 500,000,000  
Stated interest rate   5.75% 5.75%