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Fair Value Measurement of Assets and Liabilities (Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Fair Value Measurement of Assets and Liabilities [Abstract] |  |
One year or less | $ 195,248 |
One year to two years | 102,721 |
Two years to three years | 60,613 |
Three years to four years | 11,444 |
Four years to five years | 13,005 |
More than five years | 106 |
Total | $ 383,137 | $ 375,283

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- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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