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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | $ 826,211 | $ 819,865 | $ 669,561 | $ 702,689 | $ 819,865 | $ 702,689 |
Accounting Standards Update [Extensible Enumeration] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member
Net income | 31,440 | 27,609 | 32,449 | 7,594 | 59,050 | 40,043 |
Compensation and benefits paid or payable in shares | 692 | (13) | 466 | (682) |  |  |
Options exercised | 21 | 128 | 20 |  |  |  |
Shares issued to Directors' | 947 |  | 733 |  |  |  |
Cumulative translation adjustments | 13,957 | (16,165) | 9,116 | (25,638) |  |  |
Pension and postretirement liability adjustments | (130) | 509 | 142 | 890 |  |  |
Derivative valuation adjustment | 1,394 | 752 | (187) | (7,708) |  |  |
Balance at end of the period | $ 868,059 | $ 826,211 | $ 706,158 | 669,561 | $ 868,059 | $ 706,158 | $ 702,689
Dividends declared per share, Class A and Class B (in dollars per share) | $ 0.20 |  | $ 0.19 |  | $ 0.40 | $ 0.38 |
Common Class A |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period |  |  | $ 39 |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 39,112,000 |  |  |  |
Options exercised (in shares) | 1,000 | 6,000 | 1,000 |  |  |  |
Dividends declared | $ (6,150) | $ (6,150) | $ (5,835) | (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 | $ 0.20 | $ 0.19 | $ 0.19 |  |  |
Common Class B |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period |  |  | $ 2 |  |  |  |
Balance at the beginning of the period (in shares) |  | 1,617,998 | 1,618,000 |  | 1,617,998 |  |
Dividends declared | $ (323) | $ (324) | $ (307) | $ (307) |  |  |
Balance at end of the period |  |  |  | $ 2 |  |  |
Balance at the end of the period (in shares) | 1,617,998 |  |  | 1,618,000 | 1,617,998 |  |
Dividends declared per share, Class A and Class B (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.19 | $ 0.19 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | $ (1,443) |  | $ (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 |  | $ 39 | $ 39 | $ 39 |
Balance at the beginning of the period (in shares) | 39,141,000 | 39,115,000 |  | 39,099,000 | 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 | $ 39 |  | $ 39 | $ 39 | $ 39
Balance at the end of the period (in shares) | 39,142,000 | 39,141,000 | 39,113,000 |  | 39,142,000 | 39,113,000 | 39,099,000
Common Stock | Common Class B |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | $ 2 | $ 2 |  | $ 2 | $ 2 | $ 2 |
Balance at the beginning of the period (in shares) | 1,618,000 | 1,618,000 |  | 1,618,000 | 1,618,000 | 1,618,000 |
Balance at end of the period | $ 2 | $ 2 | $ 2 |  | $ 2 | $ 2 | $ 2
Balance at the end of the period (in shares) | 1,618,000 | 1,618,000 | 1,618,000 |  | 1,618,000 | 1,618,000 | 1,618,000
Additional paid-in capital |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | $ 433,811 | $ 433,696 | $ 431,836 | $ 432,518 | $ 433,696 | $ 432,518 |
Compensation and benefits paid or payable in shares | 692 | (13) | 466 | (682) |  |  |
Options exercised | 21 | 128 | 20 |  |  |  |
Shares issued to Directors' | 706 |  | 416 |  |  |  |
Balance at end of the period | 435,230 | 433,811 | 432,738 | 431,836 | 435,230 | 432,738 | $ 432,518
Retained earnings |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | 791,854 | 770,746 | 700,021 | 698,496 | 770,746 | 698,496 |
Net income | 31,397 | 27,582 | 32,354 | 9,109 |  |  |
Balance at end of the period | 816,778 | 791,854 | 726,233 | 700,021 | 816,778 | 726,233 | 698,496
Retained earnings | Common Class A |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends declared | (6,150) | (6,150) | (5,835) | (5,834) |  |  |
Retained earnings | Common Class B |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends declared | (323) | (324) | (307) | (307) |  |  |
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | (1,443) |  | (1,443) |
Balance at end of the period |  |  |  |  |  |  | (1,443)
Accumulated other comprehensive income |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | (147,102) | (132,408) | (208,546) | (175,981) | (132,408) | (175,981) |
Cumulative translation adjustments | 13,774 | (15,955) | 8,964 | (25,747) |  |  |
Pension and postretirement liability adjustments | (130) | 509 | 142 | 890 |  |  |
Derivative valuation adjustment | 1,394 | 752 | (187) | (7,708) |  |  |
Balance at end of the period | (132,064) | (147,102) | (199,627) | (208,546) | (132,064) | (199,627) | (175,981)
Treasury Stock |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | $ (256,009) | $ (256,009) | $ (256,391) | $ (256,391) | $ (256,009) | $ (256,391) |
Balance at the beginning of the period (in shares) | 8,391,000 | 8,391,000 | 8,409,000 | 8,409,000 | 8,391,000 | 8,409,000 |
Shares issued to Directors' (in shares) | (11,000) |  | (15,000) |  |  |  |
Shares issued to Directors' | $ 241 |  | $ 317 |  |  |  |
Balance at end of the period | $ (255,768) | $ (256,009) | $ (256,074) | $ (256,391) | $ (255,768) | $ (256,074) | $ (256,391)
Balance at the end of the period (in shares) | 8,380,000 | 8,391,000 | 8,394,000 | 8,409,000 | 8,380,000 | 8,394,000 | 8,409,000
Noncontrolling Interest |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of the period | $ 3,616 | $ 3,799 | $ 2,600 | $ 4,006 | $ 3,799 | $ 4,006 |
Net income | 43 | 27 | 95 | (1,515) |  |  |
Cumulative translation adjustments | 183 | (210) | 152 | 109 |  |  |
Balance at end of the period | $ 3,842 | $ 3,616 | $ 2,847 | $ 2,600 | $ 3,842 | $ 2,847 | $ 4,006

X
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http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 105 -SubTopic 10 -Section 65 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 105 -SubTopic 10 -Section 65 -Paragraph 6 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4568740-111683 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 5 -Subparagraph (b) -URI 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-URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 65 -Paragraph 8 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI 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