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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value | The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the Consolidated Balance Sheets with the exception of the interest rate swap, which is measured at fair value:
|  |  | Fair Value Measurements at December 31, 2018 |  |  |  |
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market fund deposits and term deposits | $ | 180,965 |  | $ | 180,965 |  | $ | — |  | $ | —
U.S. Treasury and agency obligations | 6,495 |  | 6,495 |  | — |  | —
Commercial paper | 78,948 |  | — |  | 78,948 |  | —
Short-term investments: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 116,800 |  | 116,800 |  | — |  | —
Corporate bonds | 227,009 |  | 227,009 |  | — |  | —
Commercial paper | 156,321 |  | — |  | 156,321 |  | —
Long-term investments and other assets: |  |  |  |  |  |  |
Corporate bonds | 3,859 |  | 3,859 |  | — |  | —
Auction rate securities | 847 |  | — |  | — |  | 847
Interest rate swap | 31 |  | — |  | 31 |  | —
Total assets | $ | 771,275 |  | $ | 535,128 |  | $ | 235,300 |  | $ | 847
Liabilities |  |  |  |  |  |  |
Long-term notes | $ | 45,378 |  | $ | — |  | $ | 45,378 |  | $ | —
Contingent purchase consideration | 898 |  | — |  | — |  | 898
Total liabilities | $ | 46,276 |  | $ | — |  | $ | 45,378 |  | $ | 898
|  |  | 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 swap | 16 |  | — |  | 16 |  | —
Total assets | $ | 633,110 |  | $ | 632,078 |  | $ | 16 |  | $ | 1,016
Liabilities |  |  |  |  |  |  |
Long-term notes | $ | 48,982 |  | $ | — |  | $ | 48,982 |  | $ | —
Contingent purchase consideration | 902 |  | — |  | — |  | 902
Total liabilities | $ | 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:
|  | 2018 |  | 2017 |  | 2016
Auction rate securities |  |  |  |  |  |
Balance, January 1 |  | $ | 1,016 |  | $ | 1,144 |  | $ | 1,136
Period transactions |  | (207) |  | — |  | —
Change in fair value |  | 38 |  | (128) |  | 8
Balance, December 31 |  | $ | 847 |  | $ | 1,016 |  | $ | 1,144
Contingent purchase consideration |  |  |  |  |  |
Balance, January 1 |  | $ | 902 |  | $ | — |  | $ | 20
Period transactions |  | — |  | 902 |  | (21)
Change in fair value |  | 48 |  | — |  | 1
Foreign exchange adjustment |  | (52) |  | — |  | —
Balance, December 31 |  | $ | 898 |  | $ | 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:
|  | 2018 |  | 2017 |  | 2016
Auction rate securities |  |  |  |  |  |
Balance, January 1 |  | $ | 1,016 |  | $ | 1,144 |  | $ | 1,136
Period transactions |  | (207) |  | — |  | —
Change in fair value |  | 38 |  | (128) |  | 8
Balance, December 31 |  | $ | 847 |  | $ | 1,016 |  | $ | 1,144
Contingent purchase consideration |  |  |  |  |  |
Balance, January 1 |  | $ | 902 |  | $ | — |  | $ | 20
Period transactions |  | — |  | 902 |  | (21)
Change in fair value |  | 48 |  | — |  | 1
Foreign exchange adjustment |  | (52) |  | — |  | —
Balance, December 31 |  | $ | 898 |  | $ | 902 |  | $ | —
Maturities of Debt Securities | The following table presents the effective maturity dates of debt investments as of December 31, 2018 and December 31, 2017:
| December 31, 2018 |  |  |  | December 31, 2017 |  |
| Book Value |  | Fair Value |  | Book Value |  | Fair Value
Investment maturity |  |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |  |
Less than 1 year | $ | 585,875 |  | $ | 585,573 |  | $ | 206,257 |  | $ | 206,161
1 through 5 years | 3,859 |  | 3,859 |  | — |  | —
Total | $ | 589,734 |  | $ | 589,432 |  | $ | 206,257 |  | $ | 206,161
Available-for-sale |  |  |  |  |  |  |
Greater than 5 years | $ | 847 |  | $ | 847 |  | $ | 1,012 |  | $ | 1,016

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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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