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Debt (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 15, 2016
USD ($)
Mar. 30, 2016
USD ($)
Jan. 31, 2014
USD ($)
Dec. 16, 2013
USD ($)
Dec. 17, 2012
USD ($)
Jun. 30, 2011
USD ($)
Debt Instrument [Line Items]                  
Debt Issuance Costs, Gross     $ 9,266            
Unamortized Debt Issuance Expense $ 15,062 $ 20,281              
Gains (Losses) on Extinguishment of Debt (50,639) 0 0            
Premium and fees paid on extinguishment of debt 40,954 0 0            
Debt Instrument, Unamortized Discount $ 23,675 $ 17,911              
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount           $ 500,000      
Term-A Facility [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount           600,000      
Debt Insturment, Covenant, Minimum Interest Coverage Ratio 2.50                
Term-A Facility [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate at Period End 2.15%                
Term-A Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Commitment Fee Percentage 0.25%                
Debt instrument, covenant, cash flow ratio 6.00                
Term-A Facility [Member] | Minimum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 0.50%                
Term-A Facility [Member] | Minimum [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 1.50%                
Term-A Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Commitment Fee Percentage 0.50%                
Debt instrument, covenant, cash flow ratio 6.50                
Term-A Facility [Member] | Maximum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 1.25%                
Term-A Facility [Member] | Maximum [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 2.25%                
Term-A Facility [Member] | Secured Debt [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount           $ 600,000 $ 880,000    
Term-A Facility [Member] | Quarterly Installments Under Term Loan A Facility from March 31, 2015 through December 31, 2015 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal $ 18,500                
Term-A Facility [Member] | Quarterly Installments Under Credit Agreement Term Loan A Facility from March 31, 2016 through December 31, 2016 [Member] [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal 37,000                
Term-A Facility [Member] | Quarterly Installments Under Credit Agreement Term Loan A Facility from March 31, 2017 through December 31, 2017 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal 55,500                
Term-A Facility [Member] | Quarterly Installment Under Credit Agreement Term Loan A Facility From March 31, 2018 through September 30, 2019 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal 74,000                
Term-A Facility [Member] | Quarterly Installment Under Credit Agreement Term Loan A Facility Remainder December 16, 2019 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal $ 518,000                
5.00% Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount         $ 1,000,000        
Debt Issuance Costs, Gross         2,070        
Debt Instrument, Unamortized Discount         17,500        
Debt Instrument, Interest Rate, Stated Percentage 5.00%                
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage 102.50%                
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage 100.00%                
7.75% Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount                 $ 700,000
Debt Issuance Costs, Gross                 1,533
Write off of Deferred Debt Issuance Cost $ (970)                
Write off of Debt Discount $ 8,715                
Debt Instrument, Unamortized Discount                 $ 14,000
Debt Instrument, Interest Rate, Stated Percentage 7.75%               7.75%
Debt Instrument, Repurchased Face Amount       $ 45,551          
Debt extinguishment including principal interest and fees         $ 703,000        
4.75% Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount               $ 600,000  
Debt Issuance Costs, Gross               1,534  
Debt Instrument, Unamortized Discount               $ 10,500  
Debt Instrument, Interest Rate, Stated Percentage 4.75%                
4.75% Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage 102.375%                
4.75% Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage 100.00%                
4.75% Senior Notes [Member] | Debt Instrument, Redemption, Period Three [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Redemption Price, Percentage 101.00%                
Term-B Facility [Member]                  
Debt Instrument [Line Items]                  
Repayments of Debt     $ 587,600