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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at beginning of year $ 797 $ 1,523
Additions [1] 0 0
Deductions [2] (630) (709)
Other [3]   (17)
Balance at end of year $ 167 $ 797
[1] Includes charges to costs and expenses
[2] Deductions for uncollectible accounts receivable includes payments collected and devices recovered from customers
[3] Miscellaneous activity