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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance |  | $ 573,015 |  |
Balance, shares |  | 32,200,000 | 32,100,000 |
Net income |  | $ 83,019 | $ 32,585 | $ 52,812
Balance |  | $ 608,280 | $ 573,015 |
Balance, shares |  | 32,300,000 | 32,200,000 | 32,100,000
Common Stock [Member] | Common Class A [Member] |  |  |  |
Balance |  | $ 37 | $ 37 | $ 37
Balance, shares |  | 37,396,000 | 37,319,000 | 37,239,000
Net income |  |  |  |
Adoption of accounting standards | [1],[2] |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Compensation and benefits paid or payable in shares, shares |  | 44,000 | 44,000 | 53,000
Options exercised |  |  |  |
Options exercised, shares |  | 10,000 | 33,000 | 26,000
Shares issued to Directors' |  |  |  |
Shares issued to Directors', shares |  |  |  | 1,000
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | $ 37 | $ 37 | $ 37
Balance, shares |  | 37,450,000 | 37,396,000 | 37,319,000
Common Stock [Member] | Class B Preferred Stock [Member] |  |  |  |
Balance |  | $ 3 | $ 3 | $ 3
Balance, shares |  | 3,234,000 | 3,234,000 | 3,235,000
Net income |  |  |  |
Adoption of accounting standards | [1],[2] |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Compensation and benefits paid or payable in shares, shares |  |  |  |
Options exercised |  |  |  |
Options exercised, shares |  |  |  |
Shares issued to Directors' |  |  |  |
Shares issued to Directors', shares |  |  |  | (1,000)
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | $ 3 | $ 3 | $ 3
Balance, shares |  | 3,234,000 | 3,234,000 | 3,234,000
Additional Paid-in Capital [Member] |  |  |  |
Balance |  | $ 428,423 | $ 425,953 | $ 423,108
Net income |  |  |  |
Adoption of accounting standards | [1],[2] |  |  |
Compensation and benefits paid or payable in shares |  | 1,437 | 1,564 | 1,980
Options exercised |  | 201 | 597 | 667
Shares issued to Directors' |  | 494 | 309 | 198
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | 430,555 | 428,423 | 425,953
Retained Earnings [Member] |  |  |  |
Balance |  | 534,082 | 522,855 | 491,950
Net income |  | 82,891 | 33,111 | 52,733
Adoption of accounting standards | [1],[2] | (5,068) |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Shares issued to Directors' |  |  |  |
Dividends declared |  | (22,260) | (21,884) | (21,828)
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | 589,645 | 534,082 | 522,855
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Balance |  | (135,901) | (184,189) | (158,844)
Net income |  |  |  |
Adoption of accounting standards | [1],[2] |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Shares issued to Directors' |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  | (28,658) | 45,980 | (24,643)
Pension and postretirement liability adjustments |  | 3,427 | 1,183 | (2,994)
Derivative valuation adjustment |  | 2,744 | 1,125 | 2,292
Balance |  | (158,388) | (135,901) | (184,189)
Treasury Stock [Member] |  |  |  |
Balance |  | $ (256,876) | $ (257,136) | $ (257,391)
Balance, shares |  | 8,431,000 | 8,443,000 | 8,455,000
Net income |  |  |  |
Adoption of accounting standards | [1],[2] |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Shares issued to Directors' |  | $ 273 | $ 260 | $ 255
Shares issued to Directors', shares |  | (12,000) | (12,000) | (12,000)
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | $ (256,603) | $ (256,876) | $ (257,136)
Balance, shares |  | 8,419,000 | 8,431,000 | 8,443,000
Noncontrolling Interest [Member] |  |  |  |
Balance |  | $ 3,247 | $ 3,767 | $ 3,690
Net income |  | 128 | (526) | 79
Adoption of accounting standards | [1],[2] | (327) |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Shares issued to Directors' |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  | (17) | 6 | (2)
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance |  | $ 3,031 | $ 3,247 | $ 3,767
[1] | As described in Note 2, the Company adopted ASC 606 effective January 1, 2018, which resulted in a decrease to Retained earnings of $5.6 million and a $0.3 million decrease to Noncontrolling interest.
[2] | As described in Note 7, the Company adopted ASU 2016-16 effective January 1, 2018, which resulted in a $0.5 million increase to Retained earnings.

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