Capital Transactions (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Subsidiary Sale Of Stock [Line Items]
Number of common stock	153,000
Payroll taxes in form of stock	$ 1,300
Proceeds from exercise of stock options	$ 3,398	$ 2,603
Common stock issued under the employee stock purchase plan, shares	96,000
Proceeds from sale of stock under employee stock purchase plan	$ 826	$ 1,249
Employee Stock
Subsidiary Sale Of Stock [Line Items]
Treasury stock reissued, shares	9,000
Proceeds from sale of stock under employee stock purchase plan	$ 800
Stock Options
Subsidiary Sale Of Stock [Line Items]
Treasury stock reissued, shares	118,000
Common Stock
Subsidiary Sale Of Stock [Line Items]
Common stock issued from exercise of stock options, shares	412,000
Issuance of restricted stock units, shares	214,000
Common stock issued under the employee stock purchase plan, shares	96,000
Treasury Stock
Subsidiary Sale Of Stock [Line Items]
Common stock issued from exercise of stock options, shares	118,000
Issuance of restricted stock units, shares	26,000
Common stock issued under the employee stock purchase plan, shares	9,000