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OTHER INTANGIBLE ASSETS (NARRATIVE) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  |  |  | $ 9,700 | $ 9,600 | $ 7,200
Impairment losses | $ 5,034 | $ 3,066 | $ 0 | $ 0 | $ 373 | $ 0 | $ 0 | $ 0 |  |  | $ 8,100 | $ 373 | $ 1,205
Customer Strategy Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated royalty rate |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Growth rate |  |  |  |  |  |  |  |  | 7.00% |  |  |  |
Indefinite-Lived Trade Names |  |  |  |  |  |  |  |  | $ 5,300 | $ 5,300 |  |  |
Impairment losses |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  |  |  | 4 years 8 months 12 days |  |
Trade Names [Member] | Customer Strategy Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  | 38.00% |  |  |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  |  |  | 2 years 4 months 24 days |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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