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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 1,523 $ 1,445 $ 278
Additions [1] 0 1,084 1,141
Deductions [2] (709) (995) (16)
Other [3] (17) (11) 42
Balance at end of year $ 797 $ 1,523 $ 1,445
[1] Includes charges to costs and expenses.
[2] Deductions for uncollectible accounts receivable includes payments collected and devices recovered from customers.
[3] Miscellaneous activity.