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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis | The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2015 and 2014:
|  | December 31, 2015 |
|  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 213,336 |  |  | $ | — |  |  | $ | — |  |  | $ | 213,336 |
Cash equivalents |  |  | 49,241 |  |  |  | 2,128 |  |  |  | — |  |  |  | 51,369 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 419,958 |  |  |  | — |  |  |  | 419,958 |
Corporate debt securities |  |  | — |  |  |  | 161,634 |  |  |  | — |  |  |  | 161,634 |
U.S. government agency securities |  |  | — |  |  |  | 83,952 |  |  |  | — |  |  |  | 83,952 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 43,394 |  |  |  | — |  |  |  | 43,394 |
Commercial paper |  |  | — |  |  |  | 20,308 |  |  |  | — |  |  |  | 20,308 |
Equity and debt mutual funds |  |  | 13,954 |  |  |  | — |  |  |  | — |  |  |  | 13,954 |
Non-U.S. government securities |  |  | — |  |  |  | 424 |  |  |  | — |  |  |  | 424 |
Total |  | $ | 276,531 |  |  | $ | 731,798 |  |  | $ | — |  |  | $ | 1,008,329 |
Derivative assets |  |  | — |  |  |  | 109 |  |  |  | — |  |  |  | 109 |
Total |  | $ | 276,531 |  |  | $ | 731,907 |  |  | $ | — |  |  | $ | 1,008,438 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 37,436 |  |  | $ | 37,436 |
Derivative liabilities |  |  | — |  |  |  | 146 |  |  |  | — |  |  |  | 146 |
Total |  | $ | — |  |  | $ | 146 |  |  | $ | 37,436 |  |  | $ | 37,582 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 262,577 |  |  | $ | 2,128 |  |  | $ | — |  |  | $ | 264,705 |
Marketable securities |  |  | — |  |  |  | 477,696 |  |  |  | — |  |  |  | 477,696 |
Long-term marketable securities |  |  | 13,954 |  |  |  | 251,974 |  |  |  | — |  |  |  | 265,928 |
Prepayments |  |  | — |  |  |  | 109 |  |  |  | — |  |  |  | 109 |
|  | $ | 276,531 |  |  | $ | 731,907 |  |  | $ | — |  |  | $ | 1,008,438 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 146 |  |  | $ | — |  |  | $ | 146 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 15,500 |  |  |  | 15,500 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 21,936 |  |  |  | 21,936 |
|  | $ | — |  |  | $ | 146 |  |  | $ | 37,436 |  |  | $ | 37,582 |
|  | December 31, 2014 |
|  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |
Cash |  | $ | 111,471 |  |  | $ | — |  |  | $ | — |  |  | $ | 111,471 |
Cash equivalents |  |  | 160,218 |  |  |  | 22,567 |  |  |  | — |  |  |  | 182,785 |
Available for sale securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 402,154 |  |  |  | — |  |  |  | 402,154 |
U.S. government agency securities |  |  | — |  |  |  | 258,502 |  |  |  | — |  |  |  | 258,502 |
Corporate debt securities |  |  | — |  |  |  | 141,467 |  |  |  | — |  |  |  | 141,467 |
Commercial paper |  |  | — |  |  |  | 140,638 |  |  |  | — |  |  |  | 140,638 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 49,036 |  |  |  | — |  |  |  | 49,036 |
Equity and debt mutual funds |  |  | 12,333 |  |  |  | — |  |  |  | — |  |  |  | 12,333 |
Non-U.S. government securities |  |  | — |  |  |  | 446 |  |  |  | — |  |  |  | 446 |
Total |  | $ | 284,022 |  |  | $ | 1,014,810 |  |  | $ | — |  |  | $ | 1,298,832 |
Derivative assets |  |  | — |  |  |  | 220 |  |  |  | — |  |  |  | 220 |
Total |  | $ | 284,022 |  |  | $ | 1,015,030 |  |  | $ | — |  |  | $ | 1,299,052 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 3,350 |  |  | $ | 3,350 |
Derivative liabilities |  |  | — |  |  |  | 369 |  |  |  | — |  |  |  | 369 |
Total |  | $ | — |  |  | $ | 369 |  |  | $ | 3,350 |  |  | $ | 3,719 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 271,689 |  |  | $ | 22,567 |  |  | $ | — |  |  | $ | 294,256 |
Marketable securities |  |  | — |  |  |  | 533,787 |  |  |  | — |  |  |  | 533,787 |
Long-term marketable securities |  |  | 12,333 |  |  |  | 458,456 |  |  |  | — |  |  |  | 470,789 |
Prepayments |  |  | — |  |  |  | 220 |  |  |  | — |  |  |  | 220 |
|  | $ | 284,022 |  |  | $ | 1,015,030 |  |  | $ | — |  |  | $ | 1,299,052 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 369 |  |  | $ | — |  |  | $ | 369 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 895 |  |  |  | 895 |
Long-term other accrued liabilities |  |  | — |  |  |  | — |  |  |  | 2,455 |  |  |  | 2,455 |
|  | $ | — |  |  | $ | 369 |  |  | $ | 3,350 |  |  | $ | 3,719 |
Schedule of Changes in Fair Value of Level 3 Contingent Consideration | Changes in the fair value of Level 3 contingent consideration for the years ended December 31, 2015 and 2014 were as follows:
|  | Contingent Consideration |
|  | (in thousands) |
Balance at December 31, 2013 |  | $ | 2,230 |
Acquisition of AIT |  |  | 1,750 |
Fair value adjustment of ZTEC |  |  | (630 | )
Balance at December 31, 2014 |  |  | 3,350 |
Acquisition of Universal Robots |  |  | 31,597 |
Fair value adjustment of ZTEC |  |  | (1,600 | )
Fair value adjustment of AIT |  |  | (1,250 | )
Fair value adjustment of Universal Robots |  |  | 5,339 |
Balance at December 31, 2015 |  | $ | 37,436 |
Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument | The following table provides quantitative information associated with the fair value measurement of Teradyne’s Level 3 financial instrument:
Liability |  | December 31, 2015 Fair Value |  |  | Valuation Technique |  | Unobservable Inputs |  | Weighted Average
|  | (in thousands) |  |  |  |  |  |  |
Contingent consideration (Universal Robots) |  | $ | 21,936 |  |  | Monte Carlo simulation |  | Revenue for the period July 1, 2015—December 31, 2017 volatility |  | 15%
|  |  |  |  |  |  | Discount Rate |  | 5.5%
|  |  |  |  |  |  | Revenue for the period July 1, 2015—December 31, 2018 volatility |  | 15%
|  |  |  |  |  |  | Discount Rate |  | 5.5%
Contingent consideration (AIT) |  | $ | 500 |  |  | Income approach- discounted cash flow |  | Revenue for calendar year 2016 probability |  | 48%
|  |  |  |  |  | Discount rate |  | 4.7%
Schedule of Carrying Amounts and Fair Values of Financial Instruments | The carrying amounts and fair values of financial instruments at December 31, 2015 and 2014 were as follows:
|  | December 31, 2015 |  |  | December 31, 2014 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 264,705 |  |  | $ | 264,705 |  |  | $ | 294,256 |  |  | $ | 294,256 |
Marketable securities |  |  | 743,624 |  |  |  | 743,624 |  |  |  | 1,004,576 |  |  |  | 1,004,576 |
Derivative assets |  |  | 109 |  |  |  | 109 |  |  |  | 220 |  |  |  | 220 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 37,436 |  |  |  | 37,436 |  |  |  | 3,350 |  |  |  | 3,350 |
Derivative liabilities |  |  | 146 |  |  |  | 146 |  |  |  | 369 |  |  |  | 369 |
Schedule of Available-for-Sale Marketable Securities | The following tables summarize the composition of available for sale marketable securities at December 31, 2015 and 2014:
|  | December 31, 2015 |
|  | Available-for-Sale |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 421,060 |  |  | $ | 65 |  |  | $ | (1,167 | ) |  | $ | 419,958 |  |  | $ | 379,434 |
Corporate debt securities |  |  | 163,297 |  |  |  | 902 |  |  |  | (2,565 | ) |  |  | 161,634 |  |  |  | 145,373 |
U.S. government agency securities |  |  | 84,032 |  |  |  | 42 |  |  |  | (122 | ) |  |  | 83,952 |  |  |  | 55,120 |
Certificates of deposit and time deposits |  |  | 43,391 |  |  |  | 6 |  |  |  | (3 | ) |  |  | 43,394 |  |  |  | 10,527 |
Commercial paper |  |  | 20,298 |  |  |  | 11 |  |  |  | (1 | ) |  |  | 20,308 |  |  |  | 8,646 |
Equity and debt mutual funds |  |  | 12,996 |  |  |  | 1,119 |  |  |  | (161 | ) |  |  | 13,954 |  |  |  | 2,560 |
Non-U.S. government securities |  |  | 424 |  |  |  | — |  |  |  | — |  |  |  | 424 |  |  |  | — |
|  | $ | 745,498 |  |  | $ | 2,145 |  |  | $ | (4,019 | ) |  | $ | 743,624 |  |  | $ | 601,660 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 478,306 |  |  | $ | 38 |  |  | $ | (648 | ) |  | $ | 477,696 |  |  | $ | 374,785 |
Long-term marketable securities |  |  | 267,192 |  |  |  | 2,107 |  |  |  | (3,371 | ) |  |  | 265,928 |  |  |  | 226,875 |
|  | $ | 745,498 |  |  | $ | 2,145 |  |  | $ | (4,019 | ) |  | $ | 743,624 |  |  | $ | 601,660 |
|  | December 31, 2014 |
|  | Available-for-Sale |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 402,197 |  |  | $ | 362 |  |  | $ | (405 | ) |  | $ | 402,154 |  |  | $ | 317,771 |
U.S. government agency securities |  |  | 258,452 |  |  |  | 135 |  |  |  | (85 | ) |  |  | 258,502 |  |  |  | 104,642 |
Corporate debt securities |  |  | 139,374 |  |  |  | 2,414 |  |  |  | (321 | ) |  |  | 141,467 |  |  |  | 96,998 |
Commercial paper |  |  | 140,616 |  |  |  | 26 |  |  |  | (4 | ) |  |  | 140,638 |  |  |  | 41,747 |
Certificates of deposit and time deposits |  |  | 49,048 |  |  |  | 11 |  |  |  | (23 | ) |  |  | 49,036 |  |  |  | 20,684 |
Equity and debt mutual funds |  |  | 10,492 |  |  |  | 1,870 |  |  |  | (29 | ) |  |  | 12,333 |  |  |  | 1,234 |
Non-U.S. government securities |  |  | 446 |  |  |  | — |  |  |  | — |  |  |  | 446 |  |  |  | — |
|  | $ | 1,000,625 |  |  | $ | 4,818 |  |  | $ | (867 | ) |  | $ | 1,004,576 |  |  | $ | 583,076 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 533,833 |  |  | $ | 99 |  |  | $ | (145 | ) |  | $ | 533,787 |  |  | $ | 240,234 |
Long-term marketable securities |  |  | 466,792 |  |  |  | 4,719 |  |  |  | (722 | ) |  |  | 470,789 |  |  |  | 342,842 |
|  | $ | 1,000,625 |  |  | $ | 4,818 |  |  | $ | (867 | ) |  | $ | 1,004,576 |  |  | $ | 583,076 |
Contractual Maturities of Investments Held | The contractual maturities of investments held at December 31, 2015 were as follows:
|  | Cost |  |  | Fair Value |
|  | (in thousands) |
Due within one year |  | $ | 478,306 |  |  | $ | 477,696 |
Due after 1 year through 5 years |  |  | 209,822 |  |  |  | 209,314 |
Due after 5 years through 10 years |  |  | 5,183 |  |  |  | 5,179 |
Due after 10 years |  |  | 39,191 |  |  |  | 37,481 |
Total |  | $ | 732,502 |  |  | $ | 729,670 |
Assets Measured at Fair Value on Non-Recurring Basis | Assets measured at fair value on a non-recurring basis as of December 31, 2014 are summarized as follows:
|  |  |  |  | Fair Value Measurements at Reporting Period |  |  |  |
|  | December 31, 2014 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |  |  | Total Losses |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 273,438 |  |  | $ | — |  |  | $ | — |  |  | $ | 273,438 |  |  | $ | 98,897 |
Definite lived intangible assets |  |  | 158,237 |  |  |  | — |  |  |  | — |  |  |  | 158,237 |  |  |  | — |
Long-lived assets held and used |  |  | 10,189 |  |  |  | — |  |  |  | 10,189 |  |  |  | — |  |  |  | — |
|  | $ | 441,864 |  |  | $ | — |  |  | $ | 10,189 |  |  | $ | 431,675 |  |  | $ | 98,897 |
Schedule of Notional Amount of Derivatives | At December 31, 2015 and 2014, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts:
|  | December 31, 2015 |  |  | December 31, 2014 |
|  | Buy Position |  |  | Sell Position |  |  | Net Total |  |  | Buy Position |  |  | Sell Position |  |  | Net Total |
|  | (in millions) |
Japanese Yen |  | $ | (51.9 | ) |  | $ | — |  |  | $ | (51.9 | ) |  | $ | — |  |  | $ | 19.7 |  |  | $ | 19.7 |
British Pound Sterling |  |  | (9.5 | ) |  |  | — |  |  |  | (9.5 | ) |  |  | — |  |  |  | 11.7 |  |  |  | 11.7 |
Korean Won |  |  | (5.5 | ) |  |  | — |  |  |  | (5.5 | ) |  |  | — |  |  |  | 4.4 |  |  |  | 4.4 |
Taiwan Dollar |  |  | (5.0 | ) |  |  | — |  |  |  | (5.0 | ) |  |  | (0.9 | ) |  |  | 5.7 |  |  |  | 4.8 |
Euro |  |  | — |  |  |  | 27.2 |  |  |  | 27.2 |  |  |  | (30.6 | ) |  |  | — |  |  |  | (30.6 | )
Singapore Dollar |  |  | — |  |  |  | 15.0 |  |  |  | 15.0 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | (71.9 | ) |  | $ | 42.2 |  |  | $ | (29.7 | ) |  | $ | (31.5 | ) |  | $ | 41.5 |  |  | $ | 10.0 |
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value | The following table summarizes the fair value of derivative instruments as of December 31, 2015 and 2014:
|  | Balance Sheet Location |  | December 31, 2015 |  |  | December 31, 2014 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Prepayments |  | $ | 109 |  |  | $ | 220 |
Foreign exchange contracts |  | Other current liabilities |  |  | (146 | ) |  |  | (369 | )
Total derivatives |  |  |  | $ | (37 | ) |  | $ | (149 | )
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized | The following table summarizes the effect of derivative instruments in the statement of operations recognized for the years ended December 31, 2015, 2014 and 2013. The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the years ended December 31, 2015, 2014, and 2013, gains (losses) from the remeasurement of the monetary assets and liabilities denominated in foreign currencies were $2.5 million, $(0.9) million, and $(6.9) million, respectively.
|  | Location of Losses (Gains) Recognized in Statement of Operations |  | December 31, 2015 |  |  | December 31, 2014 |  |  | December 31, 2013 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Other (income) expense, net |  | $ | 3,047 |  |  | $ | 237 |  |  | $ | (5,933 | )
Total derivatives |  |  |  | $ | 3,047 |  |  | $ | 237 |  |  | $ | (5,933 | )

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 + Details
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