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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revision of Prior Period Financial Statements) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value | $ 537,132 | $ 545,025 | $ 495,462 | $ 498,702
Treasury stock | (256,503) | (1,024,444) | (270,052) | (1,026,117)
Stock option exercises & restricted stock vestings | 60,235 | 48,479 |  |
Total Stockholders' Equity | $ 1,258,592 | 1,127,690 | $ 1,149,706 | 1,103,916
Stock option exercises & restricted stock vestings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 46,799 |  |
Treasury stock |  | 1,673 |  |
Total Stockholders' Equity |  | 48,479 |  |
As Previously Reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 555,307 |  | 507,313
Treasury stock |  | (1,034,726) |  | (1,034,728)
Total Stockholders' Equity |  | 1,127,690 |  | 1,103,916
As Previously Reported | Stock option exercises & restricted stock vestings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | 48,470 |  |
Treasury stock |  | 2 |  |
Total Stockholders' Equity |  | 48,479 |  |
Reissuance of incorrectly accounted treasury shares | Adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Capital in excess of par value |  | (10,282) |  | (8,611)
Treasury stock |  | 10,282 |  | $ 8,611
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 |  | (1,671) |  |
Treasury stock |  | $ 1,671 |  |

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