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Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Apr. 28, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Debt Instrument [Line Items]        
Letters of credit outstanding amount   $ 800,000 $ 800,000  
Debt issuance costs   $ 7,057,000 $ 2,648,000  
Senior unsecured notes        
Debt Instrument [Line Items]        
Debt stated rate   7.25%    
Unsecured subordinated notes payable periodic payment   $ 2,700,000    
Financing Agreement        
Debt Instrument [Line Items]        
Revolving credit and term loan agreement $ 500,000,000      
Financing Agreement | Term loan B        
Debt Instrument [Line Items]        
Term loan, gross 400,000,000      
Variable interest rate     3.27%  
LIBOR plus margin range   2.50% 2.75%  
Weighted average interest rate       4.93%
Financing Agreement | Term loan B | Minimum        
Debt Instrument [Line Items]        
Variable interest rate     0.75%  
Financing Agreement | Revolving credit facility        
Debt Instrument [Line Items]        
Revolving credit and term loan agreement $ 100,000,000      
Senior 5.125% Unsecured Notes, Due 2025 | Senior unsecured notes        
Debt Instrument [Line Items]        
Debt stated rate 5.125%      
Debt issued $ 400,000,000      
Debt issuance price as percentage of par 100.00%      
Debt issuance costs $ 7,000,000      
Senior 5.125% Unsecured Notes, Due 2025 | Senior unsecured notes | Redemption Period One        
Debt Instrument [Line Items]        
Debt redemption price 100.00%      
Senior 5.125% Unsecured Notes, Due 2025 | Senior unsecured notes | Redemption Period Two        
Debt Instrument [Line Items]        
Debt redemption price 40.00%      
Senior 5.125% Unsecured Notes, Due 2025 | Term loan B        
Debt Instrument [Line Items]        
Debt issuance costs   $ 2,400,000    
Financing Agreement Amendment | Revolving credit facility | Line of Credit        
Debt Instrument [Line Items]        
Revolving credit and term loan agreement $ 125,000,000      
Pro forma net leverage ratio   5.5    
Financing Agreement Amendment | Revolving credit facility | Line of Credit | Minimum        
Debt Instrument [Line Items]        
Percentage of commitment fees of total unused commitment under revolving credit facility   0.30%    
Financing Agreement Amendment | Revolving credit facility | Line of Credit | Minimum | LIBOR        
Debt Instrument [Line Items]        
LIBOR plus margin range   1.75%    
Financing Agreement Amendment | Revolving credit facility | Line of Credit | Maximum        
Debt Instrument [Line Items]        
Percentage of commitment fees of total unused commitment under revolving credit facility   0.50%    
Financing Agreement Amendment | Revolving credit facility | Line of Credit | Maximum | LIBOR        
Debt Instrument [Line Items]        
LIBOR plus margin range   2.50%