NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 4) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rollforward of the allowance for doubtful accounts
Balance at beginning of period	$ 3,379,000	$ 3,091,000	$ 3,008,000
Charged to expense	2,186,000us-gaap_ProvisionForDoubtfulAccounts	1,802,000us-gaap_ProvisionForDoubtfulAccounts	1,141,000us-gaap_ProvisionForDoubtfulAccounts
Net write-offs	(1,319,000)	(1,514,000)	(1,058,000)
Balance at end of period	4,246,000	3,379,000	3,091,000
Restricted cash
Restricted cash to be held, related to removal of analog equipment		11,747,000
Newport
Restricted cash
Restricted cash classified as noncurrent		$ 11,400,000

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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