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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Debt [Abstract]    
Revolving line of credit limit $ 40,000  
Line of credit maturity date Sep. 23, 2018  
Period of fixed interest on line of credit at company's options 1 year  
Outstanding drawings on line of credit $ 20,000 $ 20,000
Effective interest rate 2.08%  
Remaining unused amount under line of credit $ 20,000