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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 27, 2017
Mar. 31, 2016
Mar. 31, 2016
Dec. 31, 2016
Apr. 30, 2016
Apr. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       $ 207,400,000        
New credit facility amount       55,500,000        
Maximum unrestricted cash and cash equivalents for leverage ratio calculation       $ 100,000,000        
Required prepayment amount, percent of consolidated excess cash flow       50.00%        
Long-term debt outstanding       $ 883,100,000     $ 993,000,000  
Letters of credits issued classified as restricted cash             0 $ 0
ARC [Member]                
Debt Instrument [Line Items]                
Amount outstanding       $ 0        
Minimum [Member]                
Debt Instrument [Line Items]                
Credit facility covenant leverage ratio multiple for required prepayment       3.50%        
Term Loan A [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       $ 600,000,000        
Interest rate spread     2.50% 2.00%        
Maturity date     Mar. 01, 2018          
Long-term debt outstanding       $ 600,000,000     496,000,000  
Term Loan A [Member] | Extended Maturity [Member]                
Debt Instrument [Line Items]                
Maturity date       Apr. 01, 2021        
Term Loan B [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       $ 250,000,000        
Interest rate spread     2.50% 3.25%        
Floor interest rate     1.00% 0.75%        
Maturity date     Nov. 01, 2020          
Long-term debt outstanding       $ 248,100,000     461,900,000  
Term Loan B [Member] | LIBOR                
Debt Instrument [Line Items]                
Interest rate spread       3.25%        
Term Loan B [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity $ 248,100,000              
Bank, legal and other fees $ 600,000              
Term Loan B [Member] | Subsequent Event [Member] | LIBOR                
Debt Instrument [Line Items]                
Interest rate spread 2.75%              
Term Loan B [Member] | Extended Maturity [Member]                
Debt Instrument [Line Items]                
Maturity date       Apr. 01, 2023        
Bi-lateral Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       $ 25,000,000        
New credit facility amount       19,200,000        
Bi-lateral Facility [Member] | Letters of Credit [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity         $ 25,000,000      
Tax Exempt Bonds Due 2041 [Member]                
Debt Instrument [Line Items]                
Long-term debt outstanding       35,000,000     35,100,000  
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       200,000,000        
Letter of credit maximum sublimit       $ 150,000,000        
Interest rate spread     2.50% 2.00%        
Maturity date     Mar. 01, 2018          
Revolving Credit Facility [Member] | Extended Maturity [Member]                
Debt Instrument [Line Items]                
Maturity date       Apr. 01, 2021        
International Subsidiary Letters Of Credit [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       $ 4,100,000        
Amount outstanding       0        
Amended Securitization Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity             $ 100,000,000  
New credit facility amount   $ 40,000,000 $ 40,000,000          
Amended Securitization Facility [Member] | Extended Maturity [Member]                
Debt Instrument [Line Items]                
Maturity date   Mar. 01, 2019            
Securitization Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity       32,200,000        
New credit facility amount       36,200,000        
Amount outstanding       $ 0        
Securitization Facility [Member] | ARC [Member]                
Debt Instrument [Line Items]                
Ownership interest       100.00%        
Securitization Facility [Member] | Letters of Credit [Member]                
Debt Instrument [Line Items]                
Letters of credits issued classified as restricted cash       $ 4,000,000        
AFI [Member]                
Debt Instrument [Line Items]                
Cash dividend from AFI planned to reduce total debt outstanding           $ 50,000,000    
Senior Credit Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity   $ 1,275,000,000 $ 1,275,000,000          
New credit facility amount       1,050,000,000        
April 2016 Refinancing [Member]                
Debt Instrument [Line Items]                
Bank, legal and other fees       9,300,000        
Unamortized debt financing costs written off       1,100,000        
April 2016 Refinancing [Member] | Long-term Debt [Member]                
Debt Instrument [Line Items]                
Fees capitalized and amortized into interest expense       $ 8,100,000