CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($) $ in Thousands		Nov. 30, 2016		Mar. 15, 2016	Feb. 29, 2016		Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		$ 106,458			$ 235,925
Unrealized Gains (Losses)		22			1,017
Fair Value		106,480			236,942
LoJack [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Owned, Balance, Shares							850,100
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		36,748			82,300
Unrealized Gains (Losses)		(16)			(16)
Fair Value		36,732			82,284
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		296	[1]		4,050	[2]
Unrealized Gains (Losses)		(81)	[1]		1,416	[2]
Fair Value		215	[1]		5,466	[2]
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost					8,032
Unrealized Gains (Losses)
Fair Value					8,032
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		5,058
Unrealized Gains (Losses)
Fair Value		5,058
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		30,332			6,890
Unrealized Gains (Losses)
Fair Value		30,332			6,890
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost	[3]	5,324			3,753
Unrealized Gains (Losses)	[3]	119			(383)
Fair Value	[3]	5,443			3,370
Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Cost		28,700			130,900
Unrealized Gains (Losses)
Fair Value		28,700			130,900
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		5,658			8,836
Other Assets [Member] | Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Other Assets [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		215	[1]		5,466	[2]
Other Assets [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Other Assets [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Other Assets [Member] | Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Other Assets [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[3]	5,443			3,370
Other Assets [Member] | Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		75,147			139,388
Cash and Cash Equivalents [Member] | Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		416,055			1,556
Cash and Cash Equivalents [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value			[1]			[2]
Cash and Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value					42
Cash and Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		60
Cash and Cash Equivalents [Member] | Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		30,332			6,890
Cash and Cash Equivalents [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[3]
Cash and Cash Equivalents [Member] | Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		28,700			130,900
Short Term Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		25,675			88,718
Short Term Marketable Securities [Member] | Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		20,677			80,728
Short Term Marketable Securities [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value			[1]			[2]
Short Term Marketable Securities [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value					7,990
Short Term Marketable Securities [Member] | Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		4,998
Short Term Marketable Securities [Member] | Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value
Short Term Marketable Securities [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[3]
Short Term Marketable Securities [Member] | Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value

[1] The equity investment in LoJack's French licensee, in the form of a publicly-traded common stock, is accounted for as an available-for-sale security and is valued at the quoted closing price on its market exchange. The related unrealized gains or losses are included in accumulated other comprehensive income (loss) in the stockholders' equity section of the consolidated balance sheet.

[2] The Company purchased 850,100 shares of LoJack common stock in the open market in November and December 2015, prior to entering into a definitive agreement to acquire 100% of LoJack's common stock. These shares were considered trading securities and were recorded at fair value as of February 29, 2016.

[3] The Company has established a non-qualified deferred compensation plan for certain members of management and all non-employee directors. The Company is informally funding its obligations under the deferred compensation plan by purchasing shares in various equity, bond and money market mutual funds that are held in a "Rabbi Trust" and are restricted for payment of obligations to plan participants. The deferred compensation plan liability is included in Other Non-current Liabilities in the accompanying consolidated balance sheets.