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Debt And Liquidity (Narrative) (Details)
12 Months Ended
Feb. 27, 2015
USD ($)
Nov. 30, 2010
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jul. 28, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 23, 2014
USD ($)
Nov. 20, 2012
Debt Instrument [Line Items]                
Other Long-term Debt, Current     $ 367,200,000     $ 529,700,000    
Long-term debt     $ 362,455,000     341,615,000    
Senior subordinated notes implied rate     7.00%          
Loan balance, net of unamortized discount     $ 367,227,000     529,719,000    
Debt Instrument, Covenant, Cash Minimum Interest Coverage Ratio, Minimum     600.0          
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum     1,916.7000          
Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage               6.375%
Loan balance, net of unamortized discount     $ 267,827,000     300,000,000    
Senior Subordinated Notes [Member]                
Debt Instrument [Line Items]                
Face amount of debt issued in connection with acquisition   $ 200,000,000            
Senior subordinated notes implied rate   7.00%            
Loan balance, net of unamortized discount     0     187,973,000    
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Revolving Facility     $ 98,000,000     $ 40,000,000    
Amended and Restated Credit Agreement February 2015 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Unused Borrowing Capacity, Amount       $ 205,000,000        
Letters of Credit Outstanding, Amount       $ 7,900,000        
Amended and Restated Credit Agreement February 2015 [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%              
Amended and Restated Credit Agreement February 2015 [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.70%              
Amended and Restated Credit Agreement February 2015 [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity             $ 400,000,000  
Amended and Restated Credit Agreement February 2015 [Member] | Term Loan Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000,000              
Amended and Restated Credit Agreement July 2015 [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity         $ 375,000,000      
Amended and Restated Credit Agreement July 2015 [Member] | Term Loan Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity         $ 40,000,000      
London Interbank Offered Rate (LIBOR) [Member] | Amended and Restated Credit Agreement February 2015 [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate 2.25%              
London Interbank Offered Rate (LIBOR) [Member] | Amended and Restated Credit Agreement February 2015 [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate 4.75%