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Short-term and long-term investments | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Equity Securities | Short-term and long-term investments The Company adopted ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, and related ASU 2018-03 concerning certain technical corrections and improvements, effective January 1, 2018. Under ASU 2016-01 all changes in the fair values of equity securities with readily determinable fair values are to be recognized in current earnings. Adoption of these ASUs, in conjunction with ASU 2018-02, resulted in a cumulative effect of change in accounting principle effective January 1, 2018 which decreased accumulated other comprehensive income and increased retained earnings by $5,662 in after-tax unrealized gains accumulated in other comprehensive income through December 31, 2017 from equity securities previously classified as available-for-sale investments. From January 1, 2018, equity securities that have readily determinable fair values or redemption values are recorded at estimated fair value with changes in their value recognized in current earnings within "Other income, net". The Company classifies its debt securities as held-to-maturity and records them at amortized cost based on its intentions and strategy concerning those investments. The Company classifies these debt and equity investments as "Short-term investments" or "Long-term investments" on its consolidated balance sheet, as applicable, based on the characteristics of the financial instrument or the Company's intentions or expectations for the investment. The Company’s investments in these short-term and long-term debt and equity investments consist of the following:
| December 31, 2019 |  | December 31, 2018
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 8,140 |  |  | $ | — |  |  | $ | 8,140 |  |  | $ | 2,235 |  |  | $ | — |  |  | $ | 2,235 |
Investments in mutual funds and common stock | — |  |  | 39,951 |  |  | 39,951 |  |  | — |  |  | 36,124 |  |  | 36,124 |
| $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |  |  | $ | 2,235 |  |  | $ | 36,124 |  |  | $ | 38,359 |
Short-term investments | $ | 8,140 |  |  | $ | 3,432 |  |  | $ | 11,572 |  |  | $ | 2,235 |  |  | $ | 700 |  |  | $ | 2,935 |
Long-term investments | — |  |  | 36,519 |  |  | 36,519 |  |  | — |  |  | 35,424 |  |  | 35,424 |
| $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |  |  | $ | 2,235 |  |  | $ | 36,124 |  |  | $ | 38,359 |
Debt securities: The Company's short-term debt investments are principally bank certificates of deposit with contractual maturities longer than three months but shorter than one year. These debt securities are accounted for as held-to-maturity and recorded at amortized cost, which approximated their fair values at December 31, 2019 and 2018. Equity securities: The Company's equity investments in mutual funds and common stock are held within a trust to fund existing obligations associated with several of the Company’s non-qualified deferred compensation plans. During 2019, the Company recognized pre-tax net gains of $4,383 in other income associated with changes in the fair value of these equity securities, comprised of pre-tax realized gains of $1,459 and a net increase in unrealized gains of $2,924. During 2018, the Company recognized pre-tax net losses of $1,208 in other income associated with changes in the fair value of these equity securities, comprised of pre-tax realized gains of $4,490 and a net decrease in unrealized gains of $5,698.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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