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ACCOUNTING POLICIES (Adopted Pronouncements) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Adopted Accounting Pronouncements |  |  |
Noncurrent deferred tax assets | $ 5,965 |  | $ 2,978
Noncurrent deferred tax liabilities | 49,157 |  | 54,680
Retained earnings | 438,379 |  | 386,917
Additional paid-in capital | $ 319,436 |  | 315,318
ASC Topic 740, Balance Sheet Classification of Deferred Taxes | Adjustment |  |  |
Adopted Accounting Pronouncements |  |  |
Current deferred tax assets |  |  | (39,600)
Noncurrent deferred tax assets |  |  | 3,000
Noncurrent deferred tax liabilities |  |  | $ (36,600)
ASC Topic 718, Compensation – Stock Compensation | Adjustment |  |  |
Adopted Accounting Pronouncements |  |  |
Noncurrent deferred tax liabilities |  | $ (200) |
Retained earnings |  | (200) |
Additional paid-in capital |  | $ 400 |

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