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Debt (Details) - USD ($)
6 Months Ended
Nov. 26, 2013
May. 08, 2013
Jun. 30, 2015
Jun. 30, 2014
May. 15, 2015
Dec. 31, 2014
Aug. 15, 2013
Oct. 22, 2012
Debt [Line Items]                
Long-term debt     $ 351,312,000     $ 301,415,000    
Interest paid     10,100,000 $ 10,100,000        
Medium-term notes [Member] | Term Loan Due 2022 [Member]                
Debt [Line Items]                
Long-term debt     50,000,000     0    
Senior Notes, Face Amount         $ 50,000,000      
Senior notes [Member] | 6.375% Senior Notes Due 2020 [Member]                
Debt [Line Items]                
Long-term debt     299,990,000     299,990,000    
Unamortized premium on 6.375% senior notes     $ 1,322,000     $ 1,425,000    
Senior notes [Member] | 250 million original new 6.375% Senior Notes due 2020 [Member]                
Debt [Line Items]                
Interest rate   6.375%            
Debt Exchange, Original Debt, Amount   $ 250,000,000            
Percentage of Senior Notes tendered and accepted for exchange   100.00%            
Senior notes [Member] | 50 million additional new 6.375% Senior Notes due 2020 [Member]                
Debt [Line Items]                
Interest rate 6.375%              
Debt Exchange, Original Debt, Amount $ 49,990,000              
Percentage of Senior Notes tendered and accepted for exchange 99.98%              
Senior notes [Member] | $250 million original 6.375% Senior Notes due 2020 [Member]                
Debt [Line Items]                
Senior Notes, Face Amount               $ 250,000,000
Interest rate               6.375%
Senior notes [Member] | 50 million additional old 6.375% Senior Notes due 2020 [Member]                
Debt [Line Items]                
Senior Notes, Face Amount             $ 50,000,000  
Premium rate on 6.375% senior notes             103.50%