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.