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Changes in Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Balance | $ 511,290 |
Net income | 10,974 | $ 13,316
Compensation and benefits paid or payable in shares | 989 |
Options exercised | 75 |
Dividends declared | (5,467) |
Cumulative translation adjustments | 10,131 |
Pension and postretirement liability adjustments | (29) |
Derivative valuation adjustment | 630 |
Balance | 528,593 |
Common Stock [Member] |  |
Balance | 40 |
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 |
Additional Paid-in Capital [Member] |  |
Balance | 425,953 |
Net income |  |
Compensation and benefits paid or payable in shares | 989 |
Options exercised | 75 |
Dividends declared |  |
Cumulative translation adjustments |  |
Pension and postretirement liability adjustments |  |
Derivative valuation adjustment |  |
Balance | 427,017 |
Retained Earnings [Member] |  |
Balance | 522,855 |
Net income | 10,839 |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Dividends declared | (5,467) |
Cumulative translation adjustments |  |
Pension and postretirement liability adjustments |  |
Derivative valuation adjustment |  |
Balance | 528,227 |
Total Other Comprehensive Income [Member] |  |
Balance | (184,189) |
Net income |  |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Dividends declared |  |
Cumulative translation adjustments | 10,126 |
Pension and postretirement liability adjustments | (29) |
Derivative valuation adjustment | 630 |
Balance | (173,462) |
Treasury Stock [Member] |  |
Balance | (257,136) |
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 | (257,136) |
Noncontrolling Interest [Member] |  |
Balance | 3,767 |
Net income | 135 |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Dividends declared |  |
Cumulative translation adjustments | 5 |
Pension and postretirement liability adjustments |  |
Derivative valuation adjustment |  |
Balance | $ 3,907 |

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