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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Cortina (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2004	Dec. 31, 2016	Dec. 31, 2015
ImmenStar, Inc. | Series A preferred stock
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Payments to acquire investments	$ 2.0
Cortina
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Gain on sale of shares		$ 0.1	$ 1.6

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- Definition

For investments in debt and equity securities accounted for at cost, the excess of net sale proceeds over the carrying amount of investments disposed of during the period.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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