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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS Prior Period Statements of Income Adjustments, Adoption of ASU 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
NET REVENUES |  | $ 108,249 |  | $ 111,255 | $ 107,563 | $ 104,688 | $ 102,436 | $ 101,625 | $ 97,571 | $ 88,036 | $ 431,755 | $ 389,668 | $ 344,609
COST OF REVENUES |  |  |  |  |  |  |  |  |  |  | 218,091 | 197,477 | 171,309
PROVISION FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  | 32,690 | 1,054 | 179
Net income |  | $ (16,898) | [1] | $ 16,506 | $ 13,902 | $ 14,099 | $ 14,303 | $ 12,809 | $ 11,407 | $ 10,379 | $ 27,609 | $ 48,898 | $ 39,152
Basic |  | $ (0.57) |  | $ 0.55 | $ 0.47 | $ 0.48 | $ 0.49 | $ 0.44 | $ 0.40 | $ 0.36 | $ 0.93 | $ 1.69 | $ 1.35
Diluted | [2] | $ (0.57) |  | $ 0.54 | $ 0.46 | $ 0.47 | $ 0.48 | $ 0.43 | $ 0.39 | $ 0.35 | $ 0.90 | $ 1.65 | $ 1.32
As Reported |  |  |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  |  |  |  | $ 387,393 | $ 343,989
COST OF REVENUES |  |  |  |  |  |  |  |  |  |  |  | 196,232 | 170,602
PROVISION FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | 1,032 | 271
Net income |  |  |  |  |  |  |  |  |  |  |  | $ 47,890 | $ 39,147
Basic |  |  |  |  |  |  |  |  |  |  |  | $ 1.66 | $ 1.35
Diluted |  |  |  |  |  |  |  |  |  |  |  | $ 1.62 | $ 1.32
Adjustments for Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  |  |  |  | $ 2,275 | $ 620
COST OF REVENUES |  |  |  |  |  |  |  |  |  |  |  | 1,245 | 707
PROVISION FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | 22 | (92)
Net income |  |  |  |  |  |  |  |  |  |  |  | $ 1,008 | $ 5
Basic |  |  |  |  |  |  |  |  |  |  |  | $ 0.03 | $ 0.00
Diluted |  |  |  |  |  |  |  |  |  |  |  | $ 0.03 | $ 0.00
[1] | In December 2017 the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (Refer to Note 11, Provision for Income Taxes, in the Notes to Consolidated Financial Statements).
[2] | The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has included in the 2017, 2016 and 2015 calculations those shares that were contingently issuable upon the satisfaction of the performance conditions as of the end of the respective periods.

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