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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS Prior Period Balance Sheet Adjustments, Adoption of ASU 2014-09 (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Condensed Consolidated Balance Sheet Data |  |
Accounts Receivable, Net, Current | $ 15,046 | $ 6,528
Prepaid expenses and other current assets | 16,770 | 8,715
DEFERRED TAX ASSETS | 19,857 | 11,342
Deferred Income, Current |  | 0
Other accrued liabilities | 3,409 | 2,734
Retained earnings | $ 350,393 | 332,891
As Reported |  |
Condensed Consolidated Balance Sheet Data |  |
Accounts Receivable, Net, Current |  | 6,961
Prepaid expenses and other current assets |  | 8,520
DEFERRED TAX ASSETS |  | 12,032
Deferred Income, Current |  | 16,207
Other accrued liabilities |  | 2,434
Retained earnings |  | 317,912
Adjustments for Accounting Standards Update 2014-09 [Member] |  |
Condensed Consolidated Balance Sheet Data |  |
Accounts Receivable, Net, Current |  | (433)
Prepaid expenses and other current assets |  | 195
DEFERRED TAX ASSETS |  | (690)
Deferred Income, Current |  | (16,207)
Other accrued liabilities |  | 300
Retained earnings |  | $ 14,979

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