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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revision of Prior Period Financial Statements) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value | $ 495,462 | $ 498,702 | $ 488,292 | $ 426,884
Treasury stock | (270,052) | (1,026,117) | (738,558) | (622,075)
Stock option exercises & restricted stock vestings | 84,568 | 63,377 | 63,751 |
Total Stockholders' Equity | $ 1,149,706 | 1,103,916 | 1,480,308 | 1,380,498
Stock option exercises & restricted stock vestings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 60,410 | 61,408 |
Treasury stock |  | 2,958 | 2,330 |
Total Stockholders' Equity |  | 63,377 | 63,751 |
As Previously Reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 507,313 | 493,947 | 430,210
Treasury stock |  | (1,034,728) | (744,213) | (625,401)
Total Stockholders' Equity |  | 1,103,916 | 1,480,308 | 1,380,498
As Previously Reported | Stock option exercises & restricted stock vestings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 63,366 | 63,737 |
Treasury stock |  | 2 | 1 |
Total Stockholders' Equity |  | 63,377 | 63,751 |
Reissuance of incorrectly accounted treasury shares | Adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | (8,611) | (5,655) | (3,326)
Treasury stock |  | 8,611 | 5,655 | $ 3,326
Reissuance of incorrectly accounted treasury shares | Adjustment | Stock option exercises & restricted stock vestings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | (2,956) | (2,329) |
Treasury stock |  | $ 2,956 | $ 2,329 |

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