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Credit Agreement (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 09, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Oct. 15, 2015
CNY (¥)
Oct. 15, 2015
USD ($)
Revolving Credit Facility | Line of Credit | Second Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Long-term Line of Credit   $ 307,000 $ 307,000    
Letters of Credit Outstanding, Amount   100 100    
Remaining borrowing capacity   $ 92,900 $ 92,900    
Weighted average interest rate   1.46% 1.46%    
Debt Instrument Period of Initial Variable Rate     30 days    
Adjusted LIBOR interest rate   0.19% 0.19%    
Proceeds from Lines of Credit   $ 295,000      
Repayments of Lines of Credit   26,000      
Revolving Credit Facility | Line of Credit | Amended China Credit Agreement          
Debt Instrument [Line Items]          
Long-term Line of Credit   9,300 $ 9,300    
Repayments of Lines of Credit   $ 4,900      
Debt Instrument, Interest Rate, Effective Percentage   4.60% 4.60%    
Subsequent Event          
Debt Instrument [Line Items]          
Additional available credit | ¥       ¥ 150,000,000  
Subsequent Event | Revolving Credit Facility | Line of Credit | Second Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Long-term Line of Credit $ 292,000        
Proceeds from Lines of Credit 30,000        
Repayments of Lines of Credit $ 45,000        
Additional available credit         $ 24,000
Capacity available for fully owned subsidiary       ¥ 50,000,000 $ 8,000