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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Assets And Liabilities Measured At Fair Value | The following table presents information about the Company's assets and liabilities measured at fair value:
| Fair Value Measurements at September 30, 2018 |  |  |  |  |  |
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market fund deposits and term deposits | $ | 316,442 |  | $ | 316,442 |  | $ | — |  | $ | —
U.S. Treasury and agency obligations | 8,999 |  | 8,999 |  | — |  | —
Commercial paper | 89,312 |  | — |  | 89,312 |  | —
Short-term investments |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 113,094 |  | 113,094 |  | — |  | —
Corporate bonds | 196,856 |  | 196,856 |  | — |  | —
Commercial paper | 164,255 |  | — |  | 164,255 |  | —
Long-term investments and other assets: |  |  |  |  |  |  |
Corporate bonds | 13,771 |  | 13,771 |  | — |  | —
Auction rate securities | 967 |  | — |  | — |  | 967
Interest rate swap | 13 |  | — |  | 13 |  | —
Total | $ | 903,709 |  | $ | 649,162 |  | $ | 253,580 |  | $ | 967
Liabilities |  |  |  |  |  |  |
Long-term debt | $ | 46,285 |  | $ | — |  | $ | 46,285 |  | $ | —
Contingent purchase consideration | 902 |  | — |  | — |  | 902
Total | $ | 47,187 |  | $ | — |  | $ | 46,285 |  | $ | 902
| Fair Value Measurements at December 31, 2017 |  |  |  |  |  |
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market fund deposits and term deposits | $ | 425,917 |  | $ | 425,917 |  | $ | — |  | $ | —
Short-term investments |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 41,217 |  | 41,217 |  | — |  | —
Corporate bonds | 131,048 |  | 131,048 |  | — |  | —
Commercial paper | 33,896 |  | 33,896 |  | — |  | —
Long-term investments and other assets: |  |  |  |  |  |  |
Auction rate securities | 1,016 |  | — |  | — |  | 1,016
Interest rate swaps | 16 |  | — |  | 16 |  | —
Total | $ | 633,110 |  | $ | 632,078 |  | $ | 16 |  | $ | 1,016
Liabilities |  |  |  |  |  |  |
Long-term debt | $ | 48,982 |  | $ | — |  | $ | 48,982 |  | $ | —
Contingent purchase consideration | 902 |  | — |  | — |  | 902
Total | $ | 49,884 |  | $ | — |  | $ | 48,982 |  | $ | 902
Fair Value, Assets Measured on Recurring Basis | The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2018 |  | 2017 |  | 2018 |  | 2017
Auction rate securities |  |  |  |  |  |  |
Balance, beginning of period | $ | 1,174 |  | $ | 1,148 |  | $ | 1,016 |  | $ | 1,144
Period transactions | (207) |  | (138) |  | (207) |  | (138)
Change in fair value and accretion | — |  | 2 |  | 158 |  | 6
Balance, end of period | $ | 967 |  | $ | 1,012 |  | $ | 967 |  | $ | 1,012
Contingent purchase consideration |  |  |  |  |  |  |
Balance, beginning of period | $ | 902 |  | $ | — |  | $ | 902 |  | $ | —
Balance, end of period | $ | 902 |  | $ | — |  | $ | 902 |  | $ | —
Fair Value, Liabilities Measured on Recurring Basis | The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2018 |  | 2017 |  | 2018 |  | 2017
Auction rate securities |  |  |  |  |  |  |
Balance, beginning of period | $ | 1,174 |  | $ | 1,148 |  | $ | 1,016 |  | $ | 1,144
Period transactions | (207) |  | (138) |  | (207) |  | (138)
Change in fair value and accretion | — |  | 2 |  | 158 |  | 6
Balance, end of period | $ | 967 |  | $ | 1,012 |  | $ | 967 |  | $ | 1,012
Contingent purchase consideration |  |  |  |  |  |  |
Balance, beginning of period | $ | 902 |  | $ | — |  | $ | 902 |  | $ | —
Balance, end of period | $ | 902 |  | $ | — |  | $ | 902 |  | $ | —
Schedule of Effective Maturity Dates of Held To Maturity Investments | The following table presents the effective maturity dates of held-to-maturity debt investments as of September 30, 2018 and December 31, 2017:
| September 30, 2018 |  |  |  | December 31, 2017 |  |
| Book Value |  | Fair Value |  | Book Value |  | Fair Value
Investment maturity |  |  |  |  |  |  |
Less than 1 year | $ | 572,815 |  | $ | 572,516 |  | $ | 206,161 |  | $ | 206,161
1 through 5 years | 13,776 |  | 13,771 |  | — |  | —
Greater than 5 years | 844 |  | 967 |  | 1,016 |  | 1,016
Total | $ | 587,435 |  | $ | 587,254 |  | $ | 207,177 |  | $ | 207,177

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period 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 asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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