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Long-Term Indebtedness (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 20, 2015
Feb. 24, 2014
Jun. 30, 2015
Jun. 30, 2015
Mar. 03, 2015
Dec. 31, 2014
Jun. 30, 2014
Line of Credit Facility              
Long-term indebtedness     $ 80,000 $ 80,000   $ 15,650 $ 22,288
Expected extension of credit facility agreement (in years)       1 year      
Proposed maximum borrowing capacity     125,000 $ 125,000      
Line of Credit              
Line of Credit Facility              
Debt outstanding at period end     $ 30,000 $ 30,000   $ 15,700 $ 22,300
Weighted average interest rate     1.90% 1.90%      
Remaining availability under the facilities     $ 167,300 $ 167,300      
Maximum leverage ratio     2.5 2.5      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit              
Line of Credit Facility              
Maximum borrowings under line of credit   $ 75,000     $ 100,000    
Potential increase in line of credit borrowing capacity   25,000          
Letter of credit     $ 2,700 $ 2,700      
Remaining availability under the facilities     $ 67,300 $ 67,300      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate              
Line of Credit Facility              
Interest rate       1.00%      
Minimum 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              
Remaining availability under the facilities   $ 150,000 $ 100,000 $ 100,000      
Period after request is issued, by company, for interest payable rate to be determined by Prudential   5 days          
Long-term indebtedness $ 50,000            
Debt Instrument, Term 5 years            
Interest rate during period       3.35%      
Prudential Investment Management Inc | Line of Credit | Maximum              
Line of Credit Facility              
Maturity period of Promissory Notes   12 years