INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income before income taxes                      
Domestic                 $ 1,331 $ 5,208 $ 3,913
Foreign                 6,812 5,260 5,130
Income before taxes $ 1,934 $ 2,761 $ 1,597 $ 1,851 $ 2,614 $ 3,198 $ 4,150 $ 506 8,143 10,468 9,043
Current:                      
Federal                 2,934 3,535 3,917
State                 728 478 339
Foreign                 1,485 1,940 1,825
Total current provision                 5,147 5,953 6,081
Deferred:                      
Federal                 (1,851) (1,477) (1,609)
State                 (120) (102) (86)
Foreign                 13 (210) (119)
Total deferred benefit                 (1,958) (1,789) (1,814)
Total                 $ 3,189 $ 4,164 $ 4,267
U.S. federal statutory income tax rate (as a percent)                 35.00% 35.00% 35.00%
Differences between the effective tax rates reflected in the total provision for income taxes and the U.S. federal statutory rate                      
Tax provision (benefit) computed at 35%                 $ 2,850 $ 3,664 $ 3,165
Nondeductible expenses                 565 406 541
State income taxes, net of federal benefit                 291 258 145
Tax impact of foreign operations                 283 (138) 518
Release of uncertain tax positions                 (704) (242) (14)
Other                 (96) 216 (88)
Total                 $ 3,189 $ 4,164 $ 4,267
Effective income tax rates (as a percent)                 39.20% 39.80% 47.20%
Reversal of unrealized tax benefit liability                 $ 800    
Current deferred tax asset                      
Compensation related expenses 2,097       1,266       2,097 $ 1,266  
Valuation allowance for deferred tax assets (512)       (461)       (512) (461)  
Accruals and reserves 812       639       812 639  
Total current deferred tax asset 2,397       1,444       2,397 1,444  
Current deferred tax liability                      
Prepaids (288)       (306)       (288) (306)  
Total current deferred tax liability (288)       (306)       (288) (306)  
Net current deferred tax asset 2,109       1,138       2,109 1,138  
Noncurrent deferred tax asset                      
Compensation related expenses 505       907       505 907  
Foreign currency translation 3,731       2,629       3,731 2,629  
Foreign tax credit carryovers 1,635       1,861       1,635 1,861  
Foreign net operating loss carryovers 4,341       4,442       4,341 4,442  
U.S. net operating loss carryovers 334       368       334 368  
Other 508       392       508 392  
Valuation allowance for deferred tax assets (4,634)       (5,233)       (4,634) (5,233)  
Total noncurrent deferred tax asset 6,420       5,366       6,420 5,366  
Noncurrent deferred tax liability                      
Depreciable assets (135)       (165)       (135) (165)  
Intangible assets (1,732)       (3,388)       (1,732) (3,388)  
Investment in foreign subsidiaries (1,203)       (1,182)       (1,203) (1,182)  
Total noncurrent deferred tax liability (3,070)       (4,735)       (3,070) (4,735)  
Net noncurrent deferred tax asset 3,350       631       3,350 631  
Net deferred tax asset (liability) 5,459       1,769       5,459 1,769  
Reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period                      
Balance, beginning of year       $ 2,192       $ 2,288 2,192 2,288 $ 2,470
Reductions as a result of tax positions taken during a prior period                     (139)
Additions as a result of tax positions taken during the current period                 205 146 110
Additions as a result of tax positions taken during a prior period                 270    
Reductions as a result of settlement with tax authorities                     (139)
Reductions as a result of lapse of statute                 (887) (242) (14)
Balance, end of year 1,780       $ 2,192       1,780 $ 2,192 $ 2,288
State income tax expense recognized of interest and penalties related to uncertain tax positions                 500    
Unrecognized tax benefits that would impact the company's effective tax rate $ 1,800               $ 1,800