Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jan. 27, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Debt Instrument [Line Items]        
Long-term debt, net of unamortized deferred financing costs   $ 603,493 $ 633,108 $ 667,211
Less: current maturities   (25,000) (25,000) (12,500)
Long-term debt, less current maturities and net of unamortized deferred financing costs   578,493 608,108 654,711
Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Secured credit   122,000 140,000 175,000
Credit Agreement Terminated January 27, 2015 [Member]        
Debt Instrument [Line Items]        
Unamortized deferred financing costs $ (1,900)   (2,400)  
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   609,500 640,000 675,000
Unamortized deferred financing costs $ (6,600) (6,007) (6,892) (7,789)
Debt Instrument, Term 5 years      
Credit Agreement 1.25B [Member] | Long-term Debt [Member]        
Debt Instrument [Line Items]        
Secured credit $ 500,000 487,500 500,000 500,000
Credit Agreement 1.25B [Member] | Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Secured credit   $ 122,000 $ 140,000 $ 175,000