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Long-Term Indebtedness (Details)
12 Months Ended
Apr. 27, 2016
USD ($)
Mar. 20, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 03, 2015
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility            
Long-term indebtedness     $ 49,949,000 $ 49,910,000    
Maximum            
Line of Credit Facility            
Equity Method Investment, Ownership Percentage 65.00%          
Line of Credit            
Line of Credit Facility            
Amount outstanding     0 0    
Remaining availability under the facilities     $ 297,500,000      
Maximum leverage ratio     2.5      
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     $ 2,500,000 $ 2,700,000    
Remaining availability under the facilities     $ 197,500,000      
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%      
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit            
Line of Credit Facility            
Maximum borrowings under line of credit $ 200,000,000.0          
Additional maximum borrowing capacity upon approval $ 125,000,000.0          
Prudential Investment Management Inc | Line of Credit            
Line of Credit Facility            
Long-term indebtedness   $ 50,000,000        
Weighted average interest rate   3.35%        
Remaining availability under the facilities     $ 100,000,000     $ 150,000,000.0
Debt instrument term (in years)   5 years        
Period after request is issued, by company, for interest payable rate to be determined by Prudential     5 days      
Prudential Investment Management Inc | Line of Credit | Maximum            
Line of Credit Facility            
Maturity period of Promissory Notes     12 years      
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | London Interbank Offered Rate (LIBOR) [Member] | Minimum            
Line of Credit Facility            
Debt additional margin interest rate 0.00%          
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | London Interbank Offered Rate (LIBOR) [Member] | Maximum            
Line of Credit Facility            
Debt additional margin interest rate 0.625%          
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | Federal Funds Effective Swap Rate [Member]            
Line of Credit Facility            
Interest rate 0.50%          
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | London Interbank Offered Rate (LIBOR) [Member] | Maximum            
Line of Credit Facility            
Interest rate 1.625%