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Short-term and long-term investments
 12 Months Ended
Dec. 31, 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 available-for-sale equity investments 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 such equity securities are recognized in current earnings within "Other income, net". The adoption of these ASUs did not have a material effect on these 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:
 
December 31, 2018
 
December 31, 2017
 
Debt
securities
 
Equity
securities
 
Total
 
Debt
securities
 
Equity
securities
 
Total
Certificates of deposit and other time deposits
$
2,235

 
$
—

 
$
2,235

 
$
31,630

 
$
—

 
$
31,630

Investments in mutual funds and common stock
—

 
36,124

 
36,124

 
—

 
38,895

 
38,895

 
$
2,235

 
$
36,124

 
$
38,359

 
$
31,630

 
$
38,895

 
$
70,525

Short-term investments
$
2,235

 
$
700

 
$
2,935

 
$
31,630

 
$
1,200

 
$
32,830

Long-term investments
—

 
35,424

 
35,424

 
—

 
37,695

 
37,695

 
$
2,235

 
$
36,124

 
$
38,359

 
$
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 December 31, 2018 and 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 2018, the Company recognized pre-tax net losses of $1,208 in the income statement 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. During 2017, the Company recognized pre-tax realized gains on the sale or redemption of equity securities of $360, or $220 after tax, which were previously recorded in other comprehensive income.