## Table 0 ##
(1) Amount represents the revenue not reported during the period as a result of the acquisition accounting adjustment associated with accounting for deferred revenue in business combinations.
(2) Amount represents $60.7 million of amortization expense associated with intangible assets acquired in business combinations, $35.3 million of stock-based compensation expense, the $4.6 million adjustment to revenue as reflected in (1) above and $0.6 million of transaction expenses related to business combinations.
(3) Amount represents the impact of the adjustments to operating income referred to in (2) above, adjusted for the related income tax impact of $35.0 million.
(4) Amount represents the revenue not reported during the period as a result of the acquisition accounting adjustment associated with accounting for deferred revenue in business combinations.
(5) Amount represents $67.3 million of amortization expense associated with intangible assets acquired in business combinations, $32.4 million of stock-based compensation expense, the $9.6 million adjustment to revenue as reflected in (4) above and $0.9 million of transaction expenses related to the Esterel acquisition.
(6) Amount represents the impact of the adjustments to operating income referred to in (5) above, adjusted for the related income tax impact of $37.0 million.
Note: The 2013 GAAP and non-GAAP net income and earnings per share data reflected above include $11.0 million of incremental tax benefits, or $0.12 per diluted share, related to the notification received from the IRS that the Joint Committee on Taxation took no exception to the Company's tax returns that were filed for 2009 and 2010, thus effectively settling the uncertainty regarding refund claims filed in connection with those returns.
Non-GAAP Measures Management uses non-GAAP financial measures (a) to evaluate the Company's historical and prospective financial performance as well as its performance relative to its competitors, (b) to set internal sales targets and spending budgets, (c) to allocate resources, (d) to measure operational profitability and the accuracy of forecasting, (e) to assess financial discipline over operational expenditures and (f) as an important factor in determining variable compensation for management and its employees.
In addition, many financial analysts that follow the Company focus on and publish both historical results and future projections based on non-GAAP financial measures.
The Company believes that it is in the best interest of its investors to provide this information to analysts so that they accurately report the non-GAAP financial information.
Moreover, investors have historically requested and the Company has historically reported these non-GAAP financial measures as a means of providing consistent and comparable information with past reports of financial results.
While management believes that these non-GAAP financial measures provide useful supplemental information to investors, there are limitations associated with the use of these non-GAAP financial measures.
These non-GAAP financial measures are not prepared in accordance with GAAP, are not reported by all of the Company’s competitors and may not be directly comparable to similarly titled measures of the Company’s competitors due to potential differences in the exact method of calculation.
The Company compensates for these limitations by using these non-GAAP financial measures as supplements to GAAP financial measures and by reviewing the reconciliations of the non-GAAP financial measures to their most comparable GAAP financial measures.
Table of Contents Contractual Obligations The Company's significant contractual obligations as of December 31, 2014 are summarized below:
## Table 1 ##
(1) On September 14, 2012, the Company entered into a lease agreement for 186,000 square feet of rentable space located in an office facility in Canonsburg, Pennsylvania, which serves as the Company's new headquarters.
The lease was effective as of September 14, 2012, but because the leased premises were under construction, the Company was not obligated to pay rent until three months following the date that the leased premises were delivered to ANSYS, which occurred on October 1, 2014.
The term of the lease is 183 months, beginning on October 1, 2014.
The Company shall have a one-time right to terminate the lease effective upon the last day of the tenth full year following the date of possession (December 31, 2024), by providing the landlord with at least 18 months' prior written notice of such termination.
The Company's lease for its prior headquarters expired on December 31, 2014.
(2) Other operating leases primarily include noncancellable lease commitments for the Company’s other domestic and international offices as well as certain operating equipment.
(3) Unconditional purchase obligations primarily include software licenses and long-term purchase contracts for network, communication and office maintenance services, which are unrecorded as of December 31, 2014.
(4) The Company has $17.3 million of unrecognized tax benefits, including estimated interest and penalties, that have been recorded as liabilities in accordance with income tax accounting guidance for which the Company is uncertain as to if or when such amounts may be settled.
As a result, such amounts are excluded from the table above.
(5) Other long-term obligations primarily include deferred compensation of $18.5 million (including estimated imputed interest of $300,000 within 1 year, $450,000 within 2-3 years and $90,000 within 4-5 years), pension obligations of $6.3 million for certain foreign locations of the Company and contingent consideration of $2.8 million (including estimated imputed interest of $270,000 within 1 year and $390,000 within 2-3 years)
Table of Contents Cash and Cash Equivalents Cash and cash equivalents consist primarily of highly liquid investments such as deposits held at major banks and money market mutual funds with original maturities of three months or less.
Cash equivalents are carried at cost, which approximates fair value.
The Company’s cash and cash equivalents balances comprise the following:
## Table 2 ##
The Company's money market mutual fund balances are held in various funds of a single issuer.
Short-Term Investments Short-term investments consist primarily of deposits held by certain foreign subsidiaries of the Company with original maturities of three months to one year.
The Company considers investments backed by government agencies or financial institutions with maturities of less than one year to be highly liquid and classifies such investments as short-term investments.
Short-term investments are recorded at fair value.
The Company uses the specific identification method to determine the realized gain or loss upon the sale of such securities.
The Company is averse to principal loss and seeks to preserve invested funds by limiting default risk, market risk and reinvestment risk by placing its investments with high-quality credit issuers.
Property and Equipment Property and equipment is stated at cost.
Depreciation is computed on the straight-line method over the estimated useful lives of the various classes of assets, which range from one to 40 years.
Repairs and maintenance are charged to expense as incurred.
Gains or losses from the sale or retirement of property and equipment are included in operating income.
Research and Development Research and development costs, other than certain capitalized software development costs, are expensed as incurred.
Software Development Costs Internally developed software costs required to be capitalized as defined by the accounting guidance are not material to the Company's consolidated financial statements.
Business Combinations When the Company consummates an acquisition, the assets acquired and the liabilities assumed are recognized separately from goodwill, at their acquisition date fair values.
Goodwill as of the acquisition date is measured as the excess of the fair value of consideration transferred over the net of the acquisition date fair values of the assets acquired and the liabilities assumed.
While best estimates and assumptions are used to accurately value assets acquired and liabilities assumed at the acquisition date as well as contingent consideration, where applicable, the Company's estimates are inherently uncertain and subject to refinement.
As a result, during the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill based on refinements to information regarding what was known and knowable as of the acquisition date.
Upon the earlier of the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, any subsequent adjustments are recorded in the consolidated statements of income.
Goodwill and Other Intangible Assets Goodwill represents the excess of the consideration transferred over the fair value of net identifiable assets acquired.
Other intangible assets consist of trade names, customer lists, contract backlog, acquired software and technology, and a non-compete agreement.
Intangible assets that are not considered to have an indefinite useful life are amortized over their useful lives, which are generally two to fifteen years.
Amortization expense for intangible assets was $61.0 million, $60.7 million and $67.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.

<table><tr><td></td><td colspan="8">Year Ended December 31,</td></tr><tr><td></td><td colspan="4">2013</td><td colspan="4">2012</td></tr><tr><td>(in thousands, except percentages and per share data)</td><td>AsReported</td><td>Adjustments</td><td></td><td>Non-GAAPResults</td><td>AsReported</td><td>Adjustments</td><td></td><td>Non-GAAPResults</td></tr><tr><td>Total revenue</td><td>$861,260</td><td>$4,632</td><td>-1</td><td>$865,892</td><td>$798,018</td><td>$9,636</td><td>-4</td><td>$807,654</td></tr><tr><td>Operating income</td><td>321,863</td><td>101,232</td><td>-2</td><td>423,095</td><td>294,253</td><td>110,290</td><td>-5</td><td>404,543</td></tr><tr><td>Operating profit margin</td><td>37.4%</td><td></td><td></td><td>48.9%</td><td>36.9%</td><td></td><td></td><td>50.1%</td></tr><tr><td>Net income</td><td>$245,327</td><td>$66,197</td><td>-3</td><td>$311,524</td><td>$203,483</td><td>$73,304</td><td>-6</td><td>$276,787</td></tr><tr><td>Earnings per share – diluted:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Diluted earnings per share</td><td>$2.58</td><td></td><td></td><td>$3.27</td><td>$2.14</td><td></td><td></td><td>$2.91</td></tr><tr><td>Weighted average shares – diluted</td><td>95,139</td><td></td><td></td><td>95,139</td><td>94,954</td><td></td><td></td><td>94,954</td></tr></table>
<table><tr><td></td><td>Payments Due by Period</td></tr><tr><td>(in thousands)</td><td>Total</td><td>Within 1 year</td><td>2 – 3 years</td><td>4 – 5 years</td><td>After 5 years</td></tr><tr><td>Global headquarters operating lease<sup>-1</sup></td><td>$49,415</td><td>$4,278</td><td>$8,556</td><td>$8,556</td><td>$28,025</td></tr><tr><td>Other operating leases<sup>-2</sup></td><td>29,838</td><td>10,397</td><td>12,100</td><td>4,603</td><td>2,738</td></tr><tr><td>Unconditional purchase obligations<sup>-3</sup></td><td>9,821</td><td>5,259</td><td>4,562</td><td>—</td><td>—</td></tr><tr><td>Obligations related to uncertain tax positions, including interest and penalties<sup>-4</sup></td><td>209</td><td>209</td><td>—</td><td>—</td><td>—</td></tr><tr><td>Other long-term obligations<sup>-5</sup></td><td>29,861</td><td>9,206</td><td>13,378</td><td>3,611</td><td>3,666</td></tr><tr><td>Total contractual obligations</td><td>$119,144</td><td>$29,349</td><td>$38,596</td><td>$16,770</td><td>$34,429</td></tr></table>
<table><tr><td></td><td colspan="2">December 31, 2014</td><td colspan="2">December 31, 2013</td></tr><tr><td>(in thousands, except percentages)</td><td>Amount</td><td>% of Total</td><td>Amount</td><td>% of Total</td></tr><tr><td>Cash accounts</td><td>$506,731</td><td>64.3</td><td>$439,348</td><td>59.2</td></tr><tr><td>Money market mutual funds</td><td>281,333</td><td>35.7</td><td>303,138</td><td>40.8</td></tr><tr><td>Total</td><td>$788,064</td><td></td><td>$742,486</td><td></td></tr></table>

Question: What's the difference of Total revenue as reported between 2013 and 2012? (in thousand)
Answer: 63242