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Financing Arrangements (Schedule Of Long-Term Debt) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Document Period End Date Dec. 31, 2019  
Less: Term Loan Debt Issuance Costs $ (17,553,000) $ (21,013,000)
Less: Current Portion 0 7,850,000
Total Long-Term Debt, net $ 636,297,000 $ 778,187,000
Minimum [Member]    
Debt Instrument [Line Items]    
Varying interest rates 0.00% 0.00%
Line of Credit at interest rates range 0.00% 1.59%
Maximum [Member]    
Debt Instrument [Line Items]    
Varying interest rates 0.00% 0.00%
Line of Credit at interest rates range 0.00% 4.00%
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 653,850,000 $ 777,150,000
Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 0 29,900,000
Cash Flow Hedging [Member]    
Debt Instrument [Line Items]    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax (8,580) (2,000,000)
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Derivative, Loss on Derivative $ (1,583) $ (1,600,000)