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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]                      
Revenues $ 157,585 $ 140,150 $ 133,184 $ 124,198 $ 125,538 $ 110,078 $ 103,800 $ 94,383 $ 555,117 $ 433,799 $ 334,528
Operating expenses:                      
Cost of revenues (exclusive of depreciation and amortization) 97,627 88,539 83,547 77,937 77,284 69,099 63,803 60,175 347,650 270,361 205,336
Selling, general and administrative expenses 32,980 27,893 28,541 27,083 26,377 21,153 20,711 17,627 116,497 85,868 64,930
Depreciation and amortization expense 3,743 3,906 3,854 3,617 3,208 3,040 2,423 2,211 15,120 10,882 7,538
Other operating (income)/ expenses, net 43 (418) (293) 25 13 50 33 586 (643) 682 19
Income from operations 23,192 20,230 17,535 15,536 18,656 16,736 16,830 13,784 76,493 66,006 55,008
Interest and other income, net 832 846 769 630 519 486 460 476 3,077 1,941  
Foreign exchange gain/(loss) (712) (720) (869) (499) (135) (635) (1,394) 80 (2,800) (2,084) (3,638)
Provision for income taxes 4,553 3,919 3,317 2,987 4,041 2,522 2,575 2,241 14,776 11,379 8,439
Net income 18,759 16,437 14,118 12,680 14,999 14,065 13,321 12,099 61,994 54,484 44,353
Comprehensive income 18,361 19,412 13,073 10,337 15,640 16,769 10,857 13,711 61,183 56,977 43,103
Basic net income per share (in dollars per share) $ 0.40 [1] $ 0.36 [1] $ 0.31 [1] $ 0.28 [1] $ 0.35 [1] $ 0.33 [1] $ 0.31 [1] $ 0.30 [1] $ 1.35 [1] $ 1.27 [1]  
Diluted net income per share (in dollars per share) $ 0.38 [1] $ 0.34 [1] $ 0.29 [1] $ 0.27 [1] $ 0.32 [1] $ 0.30 [1] $ 0.29 [1] $ 0.27 [1] $ 1.28 [1] $ 1.17 [1]  
Income before provision for income taxes $ 23,312 $ 20,356 $ 17,435 $ 15,667 $ 19,040 $ 16,587 $ 15,896 $ 14,340 $ 76,770 $ 65,863 $ 52,792
[1] Earnings per share amounts for each quarter may not necessarily total to the yearly earnings per share due to the weighting of shares outstanding on a quarterly and year-to-date basis.