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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 669,561,000 | $ 702,689,000 |  | $ 626,407,000 | $ 608,280,000 |  | $ 702,689,000 |  | $ 608,280,000 |  | $ 608,280,000 |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201602Member |
Net income | 32,449,000 | 7,594,000 |  | 34,259,000 | 29,408,000 |  | $ 40,043,000 |  | 63,667,000 |  |  |  |  |
Compensation and benefits paid or payable in shares | 783,000 | (682,000) |  | 1,170,000 | (547,000) |  |  |  |  |  |  |  |  |
Options exercised | 20,000 | 0 |  | 28,000 | 44,000 |  |  |  |  |  |  |  |  |
Shares issued to Directors | 416,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (5,835,000) | (5,834,000) |  | (5,523,000) | (5,231,000) |  |  |  |  |  |  |  |  |
Dividends declared Class B | (307,000) | (307,000) |  | (291,000) | (582,000) |  |  |  |  |  |  |  |  |
Cumulative translation adjustments | 9,116,000 | (25,638,000) |  | 1,000 | (662,000) |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments | 142,000 | 890,000 |  | (40,000) | (1,487,000) |  |  |  |  |  |  |  |  |
Derivative valuation adjustment | (187,000) | (7,708,000) |  | (4,695,000) | (2,851,000) |  |  |  |  |  |  |  |  |
Ending balance | 706,158,000 | 669,561,000 |  | 651,316,000 | 626,407,000 |  | 706,158,000 |  | 651,316,000 |  | $ 702,689,000 |  | $ 608,280,000 |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,443,000) | [1] |  | 35,000 | [2] | (1,443,000) | [1] | 35,000 | [2] | 35,000 | [2] |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | (1,443,000) | [1] | 35,000 | [2]
Common Stock [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 39,000 | $ 39,000 |  | $ 37,000 | $ 37,000 |  | $ 39,000 |  | $ 37,000 |  | $ 37,000 |  |  |
Beginning balance (in shares) | 39,112,000 | 39,099,000 |  | 37,478,000 | 37,450,000 |  | 39,099,000 |  | 37,450,000 |  | 37,450,000 |  |  |
Compensation and benefits paid or payable in shares |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
Compensation and benefits paid or payable in shares (in shares) | 0 | 13,000 |  | 0 |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Shares issued to Directors (in shares) | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Conversion of Class B shares to Class A shares (in shares) |  |  |  | 1,616,000 |  |  |  |  |  |  |  |  |  |
Conversion of Class B shares to Class A shares |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Ending balance | $ 39,000 | $ 39,000 |  | $ 39,000 | $ 37,000 |  | $ 39,000 |  | $ 39,000 |  | $ 39,000 |  | $ 37,000 |
Ending balance (in shares) | 39,113,000 | 39,112,000 |  | 39,096,000 | 37,478,000 |  | 39,113,000 |  | 39,096,000 |  | 39,099,000 |  | 37,450,000 |
Common Stock [Member] | Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 2,000 | $ 2,000 |  | $ 3,000 | $ 3,000 |  | $ 2,000 |  | $ 3,000 |  | $ 3,000 |  |  |
Beginning balance (in shares) | 1,618,000 | 1,618,000 |  | 3,234,000 | 3,234,000 |  | 1,618,000 |  | 3,234,000 |  | 3,234,000 |  |  |
Conversion of Class B shares to Class A shares (in shares) |  |  |  | (1,616,000) |  |  |  |  |  |  |  |  |  |
Conversion of Class B shares to Class A shares |  |  |  | $ (1,000) |  |  |  |  |  |  |  |  |  |
Ending balance | $ 2,000 | $ 2,000 |  | $ 2,000 | $ 3,000 |  | $ 2,000 |  | $ 2,000 |  | $ 2,000 |  | $ 3,000 |
Ending balance (in shares) | 1,618,000 | 1,618,000 |  | 1,618,000 | 3,234,000 |  | 1,618,000 |  | 1,618,000 |  | 1,618,000 |  | 3,234,000 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 431,836,000 | $ 432,518,000 |  | $ 430,052,000 | $ 430,555,000 |  | $ 432,518,000 |  | $ 430,555,000 |  | $ 430,555,000 |  |  |
Compensation and benefits paid or payable in shares | 466,000 | (682,000) |  | 958,000 | (547,000) |  |  |  |  |  |  |  |  |
Options exercised | 20,000 |  |  | 28,000 | 44,000 |  |  |  |  |  |  |  |  |
Shares issued to Directors | 416,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B shares to Class A shares |  |  |  | (1,000) |  |  |  |  |  |  |  |  |  |
Ending balance | 432,738,000 | 431,836,000 |  | 431,037,000 | 430,052,000 |  | 432,738,000 |  | 431,037,000 |  | 432,518,000 |  | $ 430,555,000 |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 700,021,000 | 698,496,000 |  | 613,057,000 | 589,645,000 |  | 698,496,000 |  | 589,645,000 |  | 589,645,000 |  |  |
Net income | 32,354,000 | 9,109,000 |  | 34,054,000 | 29,190,000 |  |  |  |  |  |  |  |  |
Ending balance | 726,233,000 | 700,021,000 |  | 641,297,000 | 613,057,000 |  | 726,233,000 |  | 641,297,000 |  | 698,496,000 |  | 589,645,000 |
Retained Earnings [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,443,000) | [1] |  | 35,000 | [2] | (1,443,000) | [1] | 35,000 | [2] | 35,000 | [2] |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | (1,443,000) | [1] | 35,000 | [2]
Retained Earnings [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (5,835,000) | (5,834,000) |  | (5,523,000) | (5,231,000) |  |  |  |  |  |  |  |  |
Retained Earnings [Member] | Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared Class B | (307,000) | (307,000) |  | (291,000) | (582,000) |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | (208,546,000) | (175,981,000) |  | (163,380,000) | (158,388,000) |  | (175,981,000) |  | (158,388,000) |  | (158,388,000) |  |  |
Cumulative translation adjustments | 8,964,000 | (25,747,000) |  | (1,000) | (654,000) |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments | 142,000 | 890,000 |  | (40,000) | (1,487,000) |  |  |  |  |  |  |  |  |
Derivative valuation adjustment | (187,000) | (7,708,000) |  | (4,695,000) | (2,851,000) |  |  |  |  |  |  |  |  |
Ending balance | (199,627,000) | (208,546,000) |  | (168,116,000) | (163,380,000) |  | (199,627,000) |  | (168,116,000) |  | (175,981,000) |  | (158,388,000) |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ (256,391,000) | $ (256,391,000) |  | $ (256,603,000) | $ (256,603,000) |  | $ (256,391,000) |  | $ (256,603,000) |  | $ (256,603,000) |  |  |
Beginning balance (in shares) | 8,409 | 8,409 |  | 8,419 | 8,419 |  | 8,409 |  | 8,419 |  | 8,419 |  |  |
Compensation and benefits paid or payable in shares | $ 317,000 |  |  | $ 212,000 |  |  |  |  |  |  |  |  |  |
Compensation and benefits paid or payable in shares (in shares) | (15) |  |  | (10) |  |  |  |  |  |  |  |  |  |
Ending balance | $ (256,074,000) | $ (256,391,000) |  | $ (256,391,000) | $ (256,603,000) |  | $ (256,074,000) |  | $ (256,391,000) |  | $ (256,391,000) |  | $ (256,603,000) |
Ending balance (in shares) | 8,394 | 8,409 |  | 8,409 | 8,419 |  | 8,394 |  | 8,409 |  | 8,409 |  | 8,419 |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 2,600,000 | $ 4,006,000 |  | $ 3,241,000 | $ 3,031,000 |  | $ 4,006,000 |  | $ 3,031,000 |  | $ 3,031,000 |  |  |
Net income | 95,000 | (1,515,000) |  | 205,000 | 218,000 |  |  |  |  |  |  |  |  |
Cumulative translation adjustments | 152,000 | 109,000 |  | 2,000 | (8,000) |  |  |  |  |  |  |  |  |
Ending balance | $ 2,847,000 | $ 2,600,000 |  | $ 3,448,000 | $ 3,241,000 |  | $ 2,847,000 |  | $ 3,448,000 |  | $ 4,006,000 |  | $ 3,031,000 |
[1] | As described in Note 1, the Company adopted the provisions of ASC 326, Current Expected Credit Losses (CECL) effective January 1, 2020, which resulted in a decrease to Retained earnings of $1.4 million.
[2] | The Company adopted ASC 842, Leases effective January 1, 2019, which resulted in an increase to Retained earnings of less than $0.1 million.

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