Note M Business Segments The Company, which aggregates its operating segments based on the nature of services, has three reportable segments: temporary and consultant staffing, permanent placement staffing, and risk consulting and internal audit services. The temporary and consultant segment provides specialized staffing in the accounting and finance, administrative and office, information technology, legal, advertising, marketing and web design fields. The permanent placement segment provides full-time personnel in the accounting, finance, administrative and office, and information technology fields. The risk consulting segment provides business and technology risk consulting and internal audit services. The accounting policies of the segments are set forth in Note A Summary of Significant Accounting Policies. The Company evaluates performance based on income or loss from operations before net interest income, intangible amortization expense, and income taxes. The following table provides a reconciliation of revenue and operating income (loss) by reportable segment to consolidated results (in thousands): Years Ended December 31, 2012 2011 2010 Net service revenues Temporary and consultant staffing $ 3,324,286 $ 3,050,999 $ 2,568,255 Permanent placement staffing 334,198 302,155 221,219 Risk consulting and internal audit services 452,729 423,822 385,619 $ 4,111,213 $ 3,776,976 $ 3,175,093 Operating income (loss) Temporary and consultant staffing $ 276,826 $ 209,101 $ 108,443 Permanent placement staffing 55,745 35,340 17,502 Risk consulting and internal audit services 10,875 4,977 (10,945 ) 343,446 249,418 115,000 Amortization of intangible assets 398 153 411 Interest income, net (1,197 ) (951 ) (579 ) Income before income taxes $ 344,245 $ 250,216 $ 115,168 The Company does not report total assets by segment. The following tables represent identifiable assets by business segment (in thousands): December 31, 2012 2011 2010 Accounts receivable Temporary and consultant staffing $ 336,468 $ 342,122 $ 296,722 Permanent