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v3.21.1

Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ 819,865 | $ 702,689 |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member
Net income | 27,609 | 7,594 |
Compensation and benefits paid or payable in shares | (13) | (682) |
Options exercised | 128 | 0 |
Shares issued to Directors' | 0 | 0 |
Cumulative translation adjustments | (16,165) | (25,638) |
Pension and postretirement liability adjustments | 509 | 890 |
Derivative valuation adjustment | 752 | (7,708) |
Balance at end of the period | $ 826,211 | $ 669,561 | $ 702,689
Dividends declared per share, Class A and Class B (in dollars per share) | $ 0.20 | $ 0.19 |
Common Class A |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Options exercised (in shares) | 6,000 | 0 |
Dividends declared | $ (6,150) | $ (5,834) |
Balance at end of the period |  | $ 39 |
Balance at the end of the period (in shares) |  | 39,112,000 |
Dividends declared per share, Class A and Class B (in dollars per share) | $ 0.20 | $ 0.19 |
Common Class B |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at the beginning of the period (in shares) | 1,617,998 |  |
Dividends declared | $ (324) | $ (307) |
Balance at end of the period |  | $ 2 |
Balance at the end of the period (in shares) | 1,617,998 | 1,618,000 |
Dividends declared per share, Class A and Class B (in dollars per share) | $ 0.20 | $ 0.19 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period |  | $ (1,443) |
Balance at end of the period |  |  | (1,443)
Common Stock | Common Class A |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ 39 | $ 39 |
Balance at the beginning of the period (in shares) | 39,115,000 | 39,099,000 |
Compensation and benefits paid or payable in shares (in shares) | 20,000 | 13,000 |
Balance at end of the period | $ 39 |  | $ 39
Balance at the end of the period (in shares) | 39,141,000 |  | 39,099,000
Common Stock | Common Class B |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ 2 | $ 2 |
Balance at the beginning of the period (in shares) | 1,618,000 | 1,618,000 |
Balance at end of the period | $ 2 |  | $ 2
Balance at the end of the period (in shares) | 1,618,000 |  | 1,618,000
Additional paid-in capital |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ 433,696 | $ 432,518 |
Compensation and benefits paid or payable in shares | (13) | (682) |
Options exercised | 128 | 0 |
Balance at end of the period | 433,811 | 431,836 | $ 432,518
Retained earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | 770,746 | 698,496 |
Net income | 27,582 | 9,109 |
Balance at end of the period | 791,854 | 700,021 | 698,496
Retained earnings | Common Class A |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Dividends declared | (6,150) | (5,834) |
Retained earnings | Common Class B |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Dividends declared | (324) | (307) |
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | (1,400) | (1,443) |
Balance at end of the period |  |  | (1,443)
Accumulated items of other comprehensive income |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | (132,408) | (175,981) |
Cumulative translation adjustments | (15,955) | (25,747) |
Pension and postretirement liability adjustments | 509 | 890 |
Derivative valuation adjustment | 752 | (7,708) |
Balance at end of the period | (147,102) | (208,546) | (175,981)
Treasury Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ (256,009) | $ (256,391) |
Balance at the beginning of the period (in shares) | 8,391,000 | 8,409,000 |
Balance at end of the period | $ (256,009) | $ (256,391) | $ (256,391)
Balance at the end of the period (in shares) | 8,391,000 | 8,409,000 | 8,409,000
Noncontrolling Interest |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of the period | $ 3,799 | $ 4,006 |
Net income | 27 | (1,515) |
Cumulative translation adjustments | (210) | 109 |
Balance at end of the period | $ 3,616 | $ 2,600 | $ 4,006

X
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