Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Schedule Of Long-Term Debt) (Details)

v3.4.0.3
Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Jan. 27, 2015
Debt Instrument [Line Items]        
Less: current maturities $ (25,000) $ (25,000) $ (6,250)  
Long-term debt, less current maturities and net of unamortized deferred financing costs 592,302 608,108 660,557  
Term Loan [Member]        
Debt Instrument [Line Items]        
Secured credit 493,750 500,000 500,000  
Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Secured credit 130,000 140,000 175,000  
Credit Agreement Terminated January 27, 2015 [Member]        
Debt Instrument [Line Items]        
Deferred Finance Costs, Noncurrent, Net   (2,400)   $ (1,900)
Long-term debt, net of unamortized deferred financing costs       228,100
Credit Agreement 1.25B [Member]        
Debt Instrument [Line Items]        
Secured credit       1,250,000
Long-term Debt, Gross 623,750 640,000 675,000  
Deferred Finance Costs, Noncurrent, Net (6,448) (6,892) (8,193) $ (6,600)
Long-term debt, net of unamortized deferred financing costs 617,302 633,108 666,807  
Less: current maturities (25,000) (25,000) (6,250)  
Credit Agreement 1.25B [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Secured credit 493,750 500,000 500,000  
Credit Agreement 1.25B [Member] | Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Secured credit $ 130,000 $ 140,000 $ 175,000