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Long-Term Indebtedness (Details)
3 Months Ended 12 Months Ended
Mar. 20, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 03, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility            
Long-term indebtedness   $ 50,000,000 $ 50,000,000   $ 15,650,000  
Line of Credit            
Line of Credit Facility            
Amount outstanding   0 0      
Remaining availability under the facilities   $ 197,300,000 $ 197,300,000      
Maximum leverage ratio   2.5 2.5      
Line of Credit | Maximum            
Line of Credit Facility            
Weighted average interest rate   1.90%        
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit            
Line of Credit Facility            
Maximum borrowings under line of credit       $ 100,000,000.0   $ 75,000,000.0
Potential increase in line of credit borrowing capacity           25,000,000.0
Letter of credit   $ 2,700,000 $ 2,700,000   1,900,000  
Remaining availability under the facilities   97,300,000 $ 97,300,000      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate            
Line of Credit Facility            
Interest rate     1.00%      
Stated interest rate     1.50%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate | Minimum            
Line of Credit Facility            
Interest rate     0.75%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate | Maximum            
Line of Credit Facility            
Interest rate     1.00%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR Plus            
Line of Credit Facility            
Interest rate     1.75%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR Plus | Minimum            
Line of Credit Facility            
Interest rate     1.75%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR Plus | Maximum            
Line of Credit Facility            
Interest rate     2.00%      
Prudential Investment Management Inc | Line of Credit            
Line of Credit Facility            
Amount outstanding         $ 0  
Long-term indebtedness $ 50,000,000          
Weighted average interest rate 3.35%          
Remaining availability under the facilities   $ 100,000,000 $ 100,000,000     $ 150,000,000.0
Period after request is issued, by company, for interest payable rate to be determined by Prudential     5 days      
Debt instrument term (in years) 5 years          
Prudential Investment Management Inc | Line of Credit | Maximum            
Line of Credit Facility            
Maturity period of Promissory Notes     12 years