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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance | $ 511,290 |  |
Balance, shares | 32,100,000 | 32,000,000 |
Net income | $ 32,585 | $ 52,812 | $ 57,265
Balance | $ 573,015 | $ 511,290 |
Balance, shares | 32,200,000 | 32,100,000 | 32,000,000
Common Stock [Member] | Common Class A [Member] |  |  |
Balance | $ 37 | $ 37 | $ 37
Balance, shares | 37,319,000 | 37,239,000 | 37,085,000
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Compensation and benefits paid or payable in shares, shares | 44,000 | 53,000 | 55,000
Options exercised |  |  |
Options exercised, shares | 33,000 | 26,000 | 99,000
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 | 37,396,000 | 37,319,000 | 37,239,000
Common Stock [Member] | Class B Preferred Stock [Member] |  |  |
Balance | $ 3 | $ 3 | $ 3
Balance, shares | 3,234,000 | 3,235,000 | 3,235,000
Net income |  |  |
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 | 3,235,000
Additional Paid-in Capital [Member] |  |  |
Balance | $ 425,953 | $ 423,108 | $ 418,972
Net income |  |  |
Compensation and benefits paid or payable in shares | 1,564 | 1,980 | 1,540
Options exercised | 597 | 667 | 2,520
Shares issued to Directors' | 309 | 198 | 76
Dividends declared |  |  |
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | 428,423 | 425,953 | 423,108
Retained Earnings [Member] |  |  |
Balance | 522,855 | 491,950 | 456,105
Net income | 33,111 | 52,733 | 57,279
Compensation and benefits paid or payable in shares |  |  |
Options exercised |  |  |
Shares issued to Directors' |  |  |
Dividends declared | (21,884) | (21,828) | (21,434)
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | 534,082 | 522,855 | 491,950
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Balance | (184,189) | (158,844) | (107,767)
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Options exercised |  |  |
Shares issued to Directors' |  |  |
Dividends declared |  |  |
Cumulative translation adjustments | 45,980 | (24,643) | (53,415)
Pension and postretirement liability adjustments | 1,183 | (2,994) | 2,941
Derivative valuation adjustment | 1,125 | 2,292 | (603)
Balance | (135,901) | (184,189) | (158,844)
Treasury Stock [Member] |  |  |
Balance | $ (257,136) | $ (257,391) | $ (257,481)
Balance, shares | 8,443,000 | 8,455,000 | 8,459,000
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Options exercised |  |  |
Shares issued to Directors' | $ 260 | $ 255 | $ 90
Shares issued to Directors', shares | (12,000) | (12,000) | (4,000)
Dividends declared |  |  |
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | $ (256,876) | $ (257,136) | $ (257,391)
Balance, shares | 8,431,000 | 8,443,000 | 8,455,000
Noncontrolling Interest [Member] |  |  |
Balance | $ 3,767 | $ 3,690 | $ 3,699
Net income | (526) | 79 | (14)
Compensation and benefits paid or payable in shares |  |  |
Options exercised |  |  |
Shares issued to Directors' |  |  |
Dividends declared |  |  |
Cumulative translation adjustments | 6 | (2) | 5
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | $ 3,247 | $ 3,767 | $ 3,690

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