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Debt (Details 2) - 9 months ended Sep. 30, 2016
€ in Thousands, $ in Thousands
USD ($)
EUR (€)
USD ($)
Line of Credit Facility      
Covenant restriction, Maximum indebtedness to EBITDA 3.25 to 1    
Covenant restriction, Minimum EBITDA to interest expense 3.50 to 1    
JPMorgan Chase Bank, National Association      
Line of Credit Facility      
Amount outstanding     $ 25,000
Weighted average interest rate   1.58% 1.58%
Expiration date Jun. 30, 2020    
Prudential Investment Management, Inc.      
Line of Credit Facility      
Amount outstanding     $ 11,143
Expiration date Jun. 30, 2018    
Series A notes      
Line of Credit Facility      
Face amount     $ 4,000
Interest rate, stated percentage   4.00% 4.00%
Note term 7 years    
Maturity date range, start Mar. 08, 2017    
Maturity date range, end Mar. 08, 2018    
Repayments of Long-term Debt $ 2,000    
Series B notes      
Line of Credit Facility      
Face amount     $ 7,143
Interest rate, stated percentage   4.10% 4.10%
Note term 10 years    
Maturity date range, start Jun. 28, 2017    
Maturity date range, end Jun. 28, 2021    
Repayments of Long-term Debt $ 1,429    
Royal Bank of Scotland Citizens, N.A.      
Line of Credit Facility      
Amount outstanding     $ 0
Maximum borrowing capacity   € 2,000 2,246
HSBC Bank (China) Company Limited, Shanghai Branch      
Line of Credit Facility      
Amount outstanding     0
Maximum borrowing capacity     $ 5,000