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Long-Term Debt - Narrative (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Mar. 31, 2013
Long-Term Debt (Textual) [Abstract]      
Current portion of long-term debt $ 2,000,000 $ 2,000,000  
Long-term debt (less current portion) 197,000,000 198,000,000  
Scheduled principal payments on long-term debt in 2014 1,000,000    
Scheduled principal payments on long-term debt in 2015 2,000,000    
Scheduled principal payments on long-term debt in 2016 2,000,000    
Scheduled principal payments on long-term debt in 2017 2,000,000    
Scheduled principal payments on long-term debt in 2018 2,000,000    
Scheduled principal payments on long-term debt in 2019 2,000,000    
Scheduled principal payments on long-term debt in later years 188,000,000    
Letters of credit outstanding amount 200,000 200,000  
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 275,000,000    
Restricted payment for dividend and share repurchase, maximum 50,000,000    
Ratio of Indebtedness to Net Capital 4.5    
Financing Agreement | Term loan
     
Long-Term Debt (Textual) [Abstract]      
Revolving credit and term loan agreement to finance acquisition 200,000,000    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.25% 3.25%  
LIBOR plus margin range 2.50%    
Weighted average interest rate 3.25%   3.70%
Financing Agreement | Term loan | Minimum
     
Long-Term Debt (Textual) [Abstract]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.75%    
Financing Agreement | Revolving Credit Facility
     
Long-Term Debt (Textual) [Abstract]      
Revolving credit and term loan agreement to finance acquisition $ 75,000,000    
Financing Agreement | Revolving Credit Facility | Minimum
     
Long-Term Debt (Textual) [Abstract]      
Line of Credit Facility, Amount Outstanding, Trigger Leverage Ratio, Percentage 20.00%    
LIBOR plus margin range 2.25%    
Financing Agreement | Revolving Credit Facility | Maximum
     
Long-Term Debt (Textual) [Abstract]      
LIBOR plus margin range 2.75%