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Schedule II-Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2014
Schedule II-Valuation and Qualifying Accounts | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (amounts in thousands)
Allowance for Doubtful Accounts Receivable: |  | Balance at beginning of period |  |  | Charges to costs and expenses |  |  | Acquisitions of business |  |  | Write-off of uncollectible accounts |  |  | Balance at end of period |
Year ended December 31, 2014 |  | $ | 395,035 |  |  | $ | 698,983 |  |  | $ | 506 |  |  | $ | (769,876 | ) |  | $ | 324,648 |
Year ended December 31, 2013 |  | $ | 311,387 |  |  | $ | 1,127,216 |  |  | $ | — |  |  | $ | (1,043,568 | ) |  | $ | 395,035 |
Year ended December 31, 2012 |  | $ | 253,405 |  |  | $ | 726,671 |  |  | $ | 5,632 |  |  | $ | (674,321 | ) |  | $ | 311,387 |
Valuation Allowance for Deferred Tax Assets: |  | Balance at beginning of period |  |  | Charges to costs and expenses |  |  | Acquisitions of business |  |  | Write-offs |  |  | Balance at end of period |
Year ended December 31, 2014 |  | $ | 46,841 |  |  | $ | 5,923 |  |  | $ | — |  |  | $ | — |  |  | $ | 52,764 |
Year ended December 31, 2013 |  | $ | 44,511 |  |  | $ | 2,330 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,841 |
Year ended December 31, 2012 |  | $ | 42,143 |  |  | $ | 2,368 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,511 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + 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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Period Type: | duration