GOODWILL AND INTANGIBLE ASSETS Intangibles Gross (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gross value	$ 369,039	$ 314,166
Accumulated amortization	(220,804)	(179,461)
Net book value of amortized intangible assets	$ 148,235	$ 134,705

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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