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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy | As of December 31, 2015, there were no financial assets or liabilities measured at fair value on a recurring basis. As of December 31, 2014, financial assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, consisted of the following (in thousands), as of:
|  |  |  | December 31, 2014 |
|  |  |  | Fair Value Measurements Using Input Types |
|  | Line Item |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Non-hedging derivative assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | Prepaid expenses and other current assets |  | $ | 0 |  |  | $ | 1,647 |  |  | $ | 0 |  |  | $ | 1,647 |
Non-hedging derivative liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | Accounts payable and accrued expenses |  | $ | 0 |  |  | $ | 6 |  |  | $ | 0 |  |  | $ | 6 |
Changes in Fair Value of Foreign Currency Forward Contracts | Changes in the fair value of our foreign currency forward contracts during 2015, 2014, and 2013 were as follows (in thousands):
|  |  |  | Years Ended December 31, |
|  | Location |  | 2015 |  |  | 2014 |  |  | 2013 |
Non-hedging derivative instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on foreign currency forward contracts |  | Other income (expense), net |  | $ | (1,641 | ) |  | $ | 1,682 |  |  | $ | (41 | )
Realized gain (loss) on foreign currency forward contracts |  | Other income (expense), net |  | $ | 2,129 |  |  | $ | (562 | ) |  | $ | (629 | )

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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 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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