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Long-Term Debt - Narrative (Details)
3 Months Ended
Oct. 02, 2017
USD ($)
Apr. 28, 2017
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Debt issuance costs     $ 8,394,000 $ 8,631,000
Senior unsecured notes        
Debt Instrument [Line Items]        
Debt stated rate     7.25%  
Unsecured subordinated notes payable periodic payment     $ 2,700,000  
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 issued   $ 400,000,000    
Debt stated rate   5.125%    
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%    
Term Loan B, Maturing 2024        
Debt Instrument [Line Items]        
Debt issued $ 300,000,000      
Net leverage ratio requirement 2.75      
Variable interest rate     3.90% 3.82%
Weighted average interest rate     3.92%  
Unsecured subordinated notes payable periodic payment $ 3,000,000      
Term Loan B, Maturing 2024 | Minimum | LIBOR        
Debt Instrument [Line Items]        
LIBOR plus margin range 2.00%      
Term Loan B, Maturing 2024 | Maximum | LIBOR        
Debt Instrument [Line Items]        
LIBOR plus margin range 1.75%      
Term Loan B, Maturing 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount       $ 400,000,000
Financing Agreement Amendment | Revolving credit facility | Line of Credit        
Debt Instrument [Line Items]        
Revolving credit and term loan agreement   $ 125,000,000    
Net leverage ratio requirement     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%