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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended | 28 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 2,900,000 | $ 2,600,000 | $ 5,200,000 | $ 4,700,000 |  |
Income tax benefit | $ 800,000 | $ 800,000 | $ 1,500,000 | $ 1,400,000 |  |
Share repurchase program authorized |  |  |  |  |  | $ 300,000,000
Repurchases of common stock (in shares) | 0.1 | 0.1 | 0.2 | 0.2 | 4.1 |
Repurchases of common stock | $ 5,500,000 | $ 5,100,000 | $ 12,257,000 | $ 10,100,000 | $ 212,100,000 |
Stock repurchase program, remaining authorized repurchase amount | 87,900,000 |  | 87,900,000 |  | 87,900,000 |
Restricted stock awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost | 23,800,000 |  | $ 23,800,000 |  | 23,800,000 |
Period for recognition (in years) |  |  | 2 years 225 days |  |  |
Fair value restricted stock | 4,500,000 | 2,300,000 | $ 6,000,000 | 6,100,000 |  |
Performance stock awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost | 900,000 |  | 900,000 |  | $ 900,000 |
Fair value restricted stock | $ 0 | $ 0 | $ 1,400,000 | $ 400,000 |  |
Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  | 5 years |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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