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Allowance for Doubtful Accounts | 6 Months Ended
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Jun. 30, 2013
Receivables [Abstract] |
Allowance for Doubtful Accounts | 5. 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 The entire disclosure for allowance for credit losses. + References No definition available. + Details
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- Details
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