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Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2014 21,844,000          
Balance at Dec. 31, 2014 $ 22 $ 355,906 $ (122,387) $ (1,566) $ (85,352) $ 146,623
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares) 233,000          
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan [1] 2,269 (500) 1,769
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares) 791,000          
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors $ 1 25 7,689 (6,473) $ 1,242
Purchase of treasury stock (in shares) (1,295,000)         (1,295,000)
Purchase of treasury stock $ (1) (13,268) $ (13,268)
Equity-based compensation expenses 5,092 5,092
Net income 1,562 1,562
Change in accumulated other comprehensive income 299 299
Balance (in shares) at Dec. 31, 2015 21,573,000          
Balance at Dec. 31, 2015 $ 22 361,023 (125,697) (1,267) (90,763) 143,318
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares) 233,000          
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan [1] 2,270 (492) 1,778
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares) 1,176,000          
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors $ 1 10 11,461 (9,670) $ 1,802
Purchase of treasury stock (in shares) (1,051,000)         (1,051,000)
Purchase of treasury stock $ (1) (10,666) $ (10,666)
Equity-based compensation expenses 5,088 5,088
Net income 4,813 4,813
Change in accumulated other comprehensive income (585) (585)
Balance (in shares) at Dec. 31, 2016 21,931,000          
Balance at Dec. 31, 2016 $ 22 366,121 (122,632) (1,852) (96,112) 145,547
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares) 227,000          
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan [1] 2,225 (330) 1,895
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares) 663,000          
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors [1] 59 6,500 (5,397) $ 1,162
Purchase of treasury stock (in shares) (389,000)         (389,000)
Purchase of treasury stock [1] (4,490) $ (4,490)
Equity-based compensation expenses 5,861 5,861
Net income (3,003) (3,003)
Change in accumulated other comprehensive income (22) (22)
Balance (in shares) at Dec. 31, 2017 22,433,000          
Balance at Dec. 31, 2017 $ 22 $ 372,041 $ (118,397) $ (1,874) $ (104,842) $ 146,950
[1] Represents an amount lower than $1.