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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Balance |  |  | $ 511,290,000 |
Net income | $ 1,233,000 | $ 10,101,000 | 12,207,000 | $ 23,417,000
Compensation and benefits paid or payable in shares |  |  | 1,670,000 |
Options exercised |  |  | 175,000 |
Dividends declared |  |  | (10,936,000) |
Cumulative translation adjustments |  |  | 28,466,000 |
Pension and postretirement liability adjustments |  |  | (747,000) |
Derivative valuation adjustment |  |  | (34,000) |
Balance | 542,091,000 |  | 542,091,000 |
Common Stock [Member] |  |  |  |
Balance |  |  | 40,000 |
Net income |  |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance | 40,000 |  | 40,000 |
Additional Paid-in Capital [Member] |  |  |  |
Balance |  |  | 425,953,000 |
Net income |  |  |  |
Compensation and benefits paid or payable in shares |  |  | 1,410,000 |
Options exercised |  |  | 175,000 |
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance | 427,538,000 |  | 427,538,000 |
Retained Earnings [Member] |  |  |  |
Balance |  |  | 522,855,000 |
Net income |  |  | 11,956,000 |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Dividends declared |  |  | (10,936,000) |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance | 523,875,000 |  | 523,875,000 |
Total Other Comprehensive Income [Member] |  |  |  |
Balance |  |  | (184,189,000) |
Net income |  |  |  |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  | 28,453,000 |
Pension and postretirement liability adjustments |  |  | (747,000) |
Derivative valuation adjustment |  |  | (34,000) |
Balance | (156,517,000) |  | (156,517,000) |
Treasury Stock [Member] |  |  |  |
Balance |  |  | (257,136,000) |
Net income |  |  |  |
Compensation and benefits paid or payable in shares |  |  | 260,000 |
Options exercised |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  |  |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance | (256,876,000) |  | (256,876,000) |
Noncontrolling Interest [Member] |  |  |  |
Balance |  |  | 3,767,000 |
Net income |  |  | 251,000 |
Compensation and benefits paid or payable in shares |  |  |  |
Options exercised |  |  |  |
Dividends declared |  |  |  |
Cumulative translation adjustments |  |  | 13,000 |
Pension and postretirement liability adjustments |  |  |  |
Derivative valuation adjustment |  |  |  |
Balance | $ 4,031,000 |  | $ 4,031,000 |

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