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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Beginning balance |  | $ 702,689 | $ 608,280 | $ 573,015 |
Beginning balance (in shares) |  | 32,300,000 | 32,300,000 |  |
Net income |  | $ 97,243 | $ 133,383 | 83,019 |
Compensation and benefits paid or payable in shares |  | 622 | 1,311 | 1,437 |
Options exercised |  | 55 | 112 | 201 |
Shares issued to Directors' |  | 883 | 752 | 767 |
Cumulative translation adjustments |  | 40,788 | (6,886) | (28,675) |
Pension and postretirement liability adjustments |  | 10,333 | (2,885) | 3,427 |
Derivative valuation adjustment |  | (6,409) | $ (7,832) | $ 2,744 |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member |
Ending balance |  | $ 819,865 | $ 702,689 | $ 608,280 |
Ending balance (in shares) |  | 32,300,000 | 32,300,000 | 32,300,000 |
Retained earnings |  | $ 770,746 | $ 698,496 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Beginning balance |  | (1,443) | 35 | $ (5,395) |
Ending balance |  |  | (1,443) | 35 |
Retained earnings |  |  |  | 100 | $ 500
Common Class A |  |  |  |  |
Dividends declared |  | $ (23,651) | (21,818) | $ (20,029) |
Conversion of Class B shares to Class A shares |  |  | $ 2 |  |
Conversion of Class B shares to Class A shares (in shares) |  |  | 1,616,000 |  |
Dividends declared per share amount (in dollars per share) |  | $ 0.77 | $ 0.73 | $ 0.69 |
Common Class B |  |  |  |  |
Beginning balance (in shares) |  | 1,617,998 |  |  |
Dividends declared |  | $ (1,245) | $ (1,763) | $ (2,231) |
Conversion of Class B shares to Class A shares |  |  | $ (1) |  |
Conversion of Class B shares to Class A shares (in shares) |  |  | (1,616,000) |  |
Ending balance (in shares) |  | 1,617,998 | 1,617,998 |  |
Dividends declared per share amount (in dollars per share) |  | $ 0.77 | $ 0.73 | $ 0.69 |
Common Class B | Standish Family Holdings, LLC |  |  |  |  |
Conversion of stock (in shares) | 1,600,000 |  |  |  |
Common Stock | Common Class A |  |  |  |  |
Beginning balance |  | $ 39 | $ 37 | $ 37 |
Beginning balance (in shares) |  | 39,099,000 | 37,450,000 | 37,396,000 |
Compensation and benefits paid or payable in shares (in shares) |  | 13,000 | 26,000 | 44,000 |
Options exercised (in shares) |  | 3,000 | 7,000 | 10,000 |
Ending balance |  | $ 39 | $ 39 | $ 37 |
Ending balance (in shares) |  | 39,115,000 | 39,099,000 | 37,450,000 |
Common Stock | Series B Preferred Stock |  |  |  |  |
Beginning balance |  | $ 2 | $ 3 | $ 3 |
Beginning balance (in shares) |  | 1,618,000 | 3,234,000 | 3,234,000 |
Ending balance |  | $ 2 | $ 2 | $ 3 |
Ending balance (in shares) |  | 1,618,000 | 1,618,000 | 3,234,000 |
Additional paid-in capital |  |  |  |  |
Beginning balance |  | $ 432,518 | $ 430,555 | $ 428,423 |
Compensation and benefits paid or payable in shares |  | 622 | 1,311 | 1,437 |
Options exercised |  | 55 | 112 | 201 |
Shares issued to Directors' |  | 501 | 540 | 494 |
Ending balance |  | 433,696 | 432,518 | 430,555 |
Retained earnings |  |  |  |  |
Beginning balance |  | 698,496 | 589,645 | 534,082 |
Net income |  | 98,589 | 132,398 | 82,891 |
Conversion of Class B shares to Class A shares |  |  | (1) |  |
Ending balance |  | 770,746 | 698,496 | 589,645 |
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Beginning balance |  | (1,443) | 35 | (5,068) |
Ending balance |  |  | (1,443) | 35 |
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment | ASC 606 |  |  |  |  |
Beginning balance |  |  |  | (5,600) |
Retained earnings | Common Class A |  |  |  |  |
Dividends declared |  | (23,651) | (21,818) | (20,029) |
Retained earnings | Common Class B |  |  |  |  |
Dividends declared |  | (1,245) | (1,763) | (2,231) |
Accumulated items of other comprehensive income |  |  |  |  |
Beginning balance |  | (175,981) | (158,388) | (135,901) |
Cumulative translation adjustments |  | 39,649 | (6,876) | (28,658) |
Pension and postretirement liability adjustments |  | 10,333 | (2,885) | 3,427 |
Derivative valuation adjustment |  | (6,409) | (7,832) | 2,744 |
Ending balance |  | (132,408) | (175,981) | (158,388) |
Treasury Stock |  |  |  |  |
Beginning balance |  | $ (256,391) | $ (256,603) | $ (256,876) |
Beginning balance (in shares) |  | 8,409,000 | 8,419,000 | 8,431,000 |
Shares issued to Directors' |  | $ 382 | $ 212 | $ 273 |
Shares issued to Directors' (in shares) |  | (18,000) | (10,000) | (12,000) |
Ending balance |  | $ (256,009) | $ (256,391) | $ (256,603) |
Ending balance (in shares) |  | 8,391,000 | 8,409,000 | 8,419,000 |
Noncontrolling Interest |  |  |  |  |
Beginning balance |  | $ 4,006 | $ 3,031 | $ 3,247 |
Net income |  | (1,346) | 985 | 128 |
Cumulative translation adjustments |  | 1,139 | (10) | (17) |
Ending balance |  | $ 3,799 | $ 4,006 | 3,031 |
Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Beginning balance |  |  |  | (327) |
Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment | ASC 606 |  |  |  |  |
Beginning balance |  |  |  | $ (300) |

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