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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Balance | $ 502,553 |  |
Balance, shares | 32,000,000 | 31,900,000 |
Net income | $ 52,812 | $ 57,265 | $ 41,749
Balance | $ 511,290 | $ 502,553 |
Balance, shares | 32,100,000 | 32,000,000 | 31,900,000
Common Stock [Member] | Common Class A [Member] |  |  |
Balance | $ 37 | $ 37 | $ 37
Balance, shares | 37,239,000 | 37,085,000 | 36,996,000
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Compensation and benefits paid or payable in shares, shares | 53,000 | 55,000 | 47,000
Conversion of Class B shares to Class A shares |  |  |
Conversion of Class B shares to Class A shares, shares |  |  | 1,000
Changes in equity related to Noncontrolling interest in ASC |  |  |
Options exercised |  |  |
Options exercised, shares | 26,000 | 99,000 | 41,000
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 | 37,319,000 | 37,239,000 | 37,085,000
Common Stock [Member] | Class B Preferred Stock [Member] |  |  |
Balance | $ 3 | $ 3 | $ 3
Balance, shares | 3,235,000 | 3,235,000 | 3,236,000
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Compensation and benefits paid or payable in shares, shares |  |  |
Conversion of Class B shares to Class A shares, shares |  |  | (1,000)
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 | 3,235,000 | 3,235,000
Additional Paid-in Capital [Member] |  |  |
Balance | $ 423,108 | $ 418,972 | $ 416,728
Net income |  |  |
Compensation and benefits paid or payable in shares | 1,980 | 1,540 | 1,234
Conversion of Class B shares to Class A shares |  |  |
Changes in equity related to Noncontrolling interest in ASC |  |  | (24)
Options exercised | 667 | 2,520 | 974
Shares issued to Directors' | 198 | 76 | 60
Dividends declared |  |  |
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | 425,953 | 423,108 | 418,972
Retained Earnings [Member] |  |  |
Balance | 491,950 | 456,105 | 434,598
Net income | 52,733 | 57,279 | 41,569
Compensation and benefits paid or payable in shares |  |  |
Conversion of Class B shares to Class A shares |  |  |
Changes in equity related to Noncontrolling interest in ASC |  |  |
Options exercised |  |  |
Shares issued to Directors' |  |  |
Dividends declared | (21,828) | (21,434) | (20,062)
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | 522,855 | 491,950 | 456,105
Accumulated items of other comprehensive income |  |  |
Balance | (158,844) | (107,767) | (49,498)
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Conversion of Class B shares to Class A shares |  |  |
Changes in equity related to Noncontrolling interest in ASC |  |  |
Options exercised |  |  |
Shares issued to Directors' |  |  |
Dividends declared |  |  |
Cumulative translation adjustments | (24,643) | (53,415) | (55,102)
Pension and postretirement liability adjustments | (2,994) | 2,941 | (3,283)
Derivative valuation adjustment | 2,292 | (603) | 116
Balance | (184,189) | (158,844) | (107,767)
Treasury Stock [Member] |  |  |
Balance | $ (257,391) | $ (257,481) | $ (257,571)
Balance, shares | 8,455,000 | 8,459,000 | 8,464,000
Net income |  |  |
Compensation and benefits paid or payable in shares |  |  |
Compensation and benefits paid or payable in shares, shares |  |  |
Conversion of Class B shares to Class A shares |  |  |
Conversion of Class B shares to Class A shares, shares |  |  |
Changes in equity related to Noncontrolling interest in ASC |  |  |
Options exercised |  |  |
Options exercised, shares |  |  |
Shares issued to Directors' | $ 255 | $ 90 | $ 90
Shares issued to Directors', shares | (12,000) | (4,000) | (5,000)
Dividends declared |  |  |
Cumulative translation adjustments |  |  |
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | $ (257,136) | $ (257,391) | $ (257,481)
Balance, shares | 8,443,000 | 8,455,000 | 8,459,000
Noncontrolling Interest [Member] |  |  |
Balance | $ 3,690 | $ 3,699 | $ 3,482
Net income | 79 | (14) | 180
Compensation and benefits paid or payable in shares | 0 |  |
Conversion of Class B shares to Class A shares |  |  |
Changes in equity related to Noncontrolling interest in ASC |  |  | 38
Options exercised | 0 |  |
Shares issued to Directors' |  |  |
Dividends declared |  |  |
Cumulative translation adjustments | (2) | 5 | (1)
Pension and postretirement liability adjustments |  |  |
Derivative valuation adjustment |  |  |
Balance | $ 3,767 | $ 3,690 | $ 3,699

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