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Long-term Debt - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
May 25, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]          
Repayments of credit facility     $ 382,147,000 $ 0  
Long-term debt   $ 395,618,000 395,618,000   $ 383,137,000
Amortization of debt issuance costs   44,000 74,000 61,000 30,000
Interest Expense, Debt     74,000 $ 61,000  
Amended Facility          
Debt Instrument [Line Items]          
Debt covenant, reduction of basis spread 0.25%        
Covenant for marginal rates, secured leverage ratio, Maximum 1        
Secured leverage ratio 4        
Repayments of credit facility $ 382,000,000        
Debt issuance cost 4,400,000        
Long-term debt   395,600,000 395,600,000   383,100,000
Amended Facility | Revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity 120,000,000        
Debt fee amount 300,000        
Revolving credit outstanding   0 0   0
Amended Facility | Term loan          
Debt Instrument [Line Items]          
Maximum borrowing capacity 400,000,000        
Debt instrument, periodic payment     1,000,000    
End of term payment   373,000,000 373,000,000    
Long-term debt   395,600,000 395,600,000   383,100,000
Fair value of debt outstanding   $ 398,100,000 $ 398,100,000   $ 386,500,000
Effective interest rate   3.80% 3.80%   3.79%
Amended Facility | Letter of credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 10,000,000        
Variable Rate Option One | Base Rate | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
Variable Rate Option One | Federal Fund Rate | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
Variable Rate Option One | One Month LIBOR | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%        
Variable Rate Option One | London Interbank Offered Rate (LIBOR) | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%        
Variable Rate Option Two | Base Rate | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
Variable Rate Option Two | London Interbank Offered Rate (LIBOR) | Amended Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.00%