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Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Apr. 01, 2015
Long-Term Debt (Textual) [Abstract]        
Current portion of long-term debt $ 6,656,000 $ 6,656,000    
Long-term debt (less current portion) 390,825,000 392,487,000    
Scheduled principal payments on long-term debt in 2016 2,000,000      
Scheduled principal payments on long-term debt in 2017 4,000,000      
Scheduled principal payments on long-term debt in 2018 4,000,000      
Scheduled principal payments on long-term debt in 2019 4,000,000      
Scheduled principal payments on long-term debt in 2020 378,500,000      
Letters of credit outstanding amount $ 800,000 $ 800,000    
Minimum        
Long-Term Debt (Textual) [Abstract]        
Percentage of commitment fees of total unused commitment under revolving credit facility 0.30%      
Maximum        
Long-Term Debt (Textual) [Abstract]        
Percentage of commitment fees of total unused commitment under revolving credit facility 0.50%      
Financing Agreement        
Long-Term Debt (Textual) [Abstract]        
Revolving credit and term loan agreement to finance acquisition       $ 500,000,000
Restricted payment for dividend and share repurchase, maximum $ 70,000,000      
Ratio of Indebtedness to Net Capital 4.5      
Term loan B | Financing Agreement        
Long-Term Debt (Textual) [Abstract]        
Revolving credit and term loan agreement, increase in borrowing capacity       200,000,000
Long-term debt, term loan       400,000,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.50% 3.50%    
LIBOR plus margin range 2.75%      
Weighted average interest rate 3.50%   3.37%  
Term loan B | Financing Agreement | Minimum        
Long-Term Debt (Textual) [Abstract]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.75%      
Revolving credit facility | Financing Agreement        
Long-Term Debt (Textual) [Abstract]        
Revolving credit and term loan agreement to finance acquisition       100,000,000
Revolving credit and term loan agreement, increase in borrowing capacity       $ 25,000,000
Revolving credit facility | Financing Agreement | Minimum        
Long-Term Debt (Textual) [Abstract]        
Line of Credit Facility, Amount Outstanding, Trigger Leverage Ratio, Percentage 20.00%      
LIBOR plus margin range 2.25%      
Revolving credit facility | Financing Agreement | Maximum        
Long-Term Debt (Textual) [Abstract]        
LIBOR plus margin range 2.75%      
Unsecured subordinated notes payable        
Long-Term Debt (Textual) [Abstract]        
Stated interest rate (percent) 7.25%      
Annual installment payments $ 2,700,000