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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Goodwill) (Details) | 12 Months Ended
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Dec. 31, 2017 reporting_unit Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of distinct operating segments through which we internally conduct and manage our operations | 1
Number of distinct operating segments through which we report our operations | 1
Number of reportable business segments and units to which goodwill is attributed (reporting unit) | reporting_unit | 1

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
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