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Investments in debt and equity securities | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments in debt and equity securities | Short-term and long-term investments Effective January 1, 2018, the Company adopted ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in this ASU revise accounting related to (i) the classification and measurement of investments in equity securities and (ii) the presentation of certain fair value changes for financial liabilities at fair value. The Company also adopted ASU 2018-03 which provides related technical corrections and improvements. The principal effect of these ASUs on the Company's consolidated financial statements is that, prior to adoption of ASU 2016-01, changes in the fair values of investments in equity securities with readily determinable fair values or redemption values were recognized in other comprehensive income until realized, while under ASU 2016-01 all changes in the fair values of these equity securities are recognized in current earnings. The adoption of these ASUs did not have a material impact on these condensed consolidated financial statements. Effective January 1, 2018, the Company recognized a cumulative effect of change in accounting principle upon adoption of ASUs 2016-01 and 2018-03, in conjunction with ASU 2018-02, the effect of which was to decrease accumulated other comprehensive income, and to increase retained earnings, by $5,662 in after-tax unrealized gains accumulated in other comprehensive income through December 31, 2017 from equity securities classified as available-for-sale investments prior to adoption of ASU 2016-01. 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. 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:
| September 30, 2018 |  | December 31, 2017
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 2,230 |  |  | $ | — |  |  | $ | 2,230 |  |  | $ | 31,630 |  |  | $ | — |  |  | $ | 31,630 |
Investments in mutual funds and common stock | — |  |  | 37,547 |  |  | 37,547 |  |  | — |  |  | 38,895 |  |  | 38,895 |
| $ | 2,230 |  |  | $ | 37,547 |  |  | $ | 39,777 |  |  | $ | 31,630 |  |  | $ | 38,895 |  |  | $ | 70,525 |
Short-term investments | $ | 2,230 |  |  | $ | 2,500 |  |  | $ | 4,730 |  |  | $ | 31,630 |  |  | $ | 1,200 |  |  | $ | 32,830 |
Long-term investments | — |  |  | 35,047 |  |  | 35,047 |  |  | — |  |  | 37,695 |  |  | 37,695 |
| $ | 2,230 |  |  | $ | 37,547 |  |  | $ | 39,777 |  |  | $ | 31,630 |  |  | $ | 38,895 |  |  | $ | 70,525 |
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 approximates their fair values at September 30, 2018 and December 31, 2017. 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 the nine months ended September 30, 2018, the Company recognized pre-tax net gains of $1,597 in the income statement associated with changes in the fair value of these equity securities, comprised of pre-tax realized gains of $4,101 and a net decrease in unrealized gains of $2,504. During the nine months ended September 30, 2017, the Company recognized pre-tax realized gains on the sale or redemption of equity securities of $362, or $221 after-tax, which was previously recorded in other comprehensive income.

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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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