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Accounts Payable and Accrued Expenses: | 12 Months Ended
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Dec. 31, 2012
Accounts Payable and Accrued Expenses: | 8. Accounts Payable and Accrued Expenses: Accounts payable and accrued expenses consist of the following (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Accounts payable |  | $ | 13,812 |  |  | $ | 12,264 |
Accrued salaries and bonuses |  |  | 160,495 |  |  |  | 147,613 |
Accrued payroll taxes and benefits |  |  | 36,176 |  |  |  | 29,443 |
Accrued professional liability risks |  |  | 17,466 |  |  |  | 13,218 |
Accrued contingent consideration |  |  | 16,109 |  |  |  | 12,089 |
Accrual for uncertain tax positions |  |  | — |  |  |  | 3,242 |
Other accrued expenses |  |  | 11,603 |  |  |  | 16,666 |
|  | $ | 255,661 |  |  | $ | 234,535 |
The net increase in accrued salaries and bonuses of $12.9 million, from $147.6 million at December 31, 2011 to $160.5 million at December 31, 2012, is primarily due to performance-based incentive compensation accrued during the year ended December 31, 2012, partially offset by the payment of performance-based incentive compensation during the first quarter of 2012. A majority of the Company’s payments for performance-based incentive compensation is paid annually in the first quarter.

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5 + Details
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