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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 1,368 | $ 657 | $ 1,329
Charged to Cost and Expenses | 354 | 941 | 244
Credited to Other Accounts | 134 | (65) | (67)
Amount Written Off | (447) | (165) | (849)
Balance at End of Period | 1,409 | 1,368 | 657
Accounts Receivable |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,206 | 490 | 722
Charged to Cost and Expenses | 453 | 941 | 195
Credited to Other Accounts | 28 | (60) | (67)
Amount Written Off | (447) | (165) | (360)
Balance at End of Period | 1,240 | 1,206 | 490
Investment in Sales-Type Leases |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 162 | 167 | 607
Charged to Cost and Expenses | (99) | 0 | 49
Credited to Other Accounts | 106 | (5) | 0
Amount Written Off | 0 | 0 | (489)
Balance at End of Period | $ 169 | $ 162 | $ 167

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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