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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 278 $ 474 $ 306
Additions 1,141 [1] 144 [1] 483 [1]
Deductions (16) [2] (313) [2] (256) [2]
Other 42 [3] (27) [3] (59) [3]
Balance at end of year $ 1,445 $ 278 $ 474
[1] Includes charges to costs and expenses, net of any equipment recovered
[2] Includes deductions for uncollectible accounts receivable, net of any equipment recovered
[3] Miscellaneous activity for product sales recognized on a cash basis