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Allowance for Doubtful Accounts (Tables) | 6 Months Ended
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Jun. 30, 2013
Receivables [Abstract] |
Summary of Allowance for Doubtful Accounts |
|  | Balance at Beginning of Period |  |  | Charged to Expense |  |  | Deductions(1) |  |  | Balance at End of Period |
Three months ended June 30, 2013 |  | $ | 8,657 |  |  |  | 9,485 |  |  |  | (9,050 | ) |  | $ | 9,092 |
Three months ended June 30, 2012 |  | $ | 11,706 |  |  |  | 7,871 |  |  |  | (11,551 | ) |  | $ | 8,026 |
(1) | Deductions represent accounts written off, net of recoveries.

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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