Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended |
In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 |
Balance, December 31, 2012 | ' | ' | $181,389 | ' |
Net earnings | 5,601 | 5,452 | 10,991 | 12,059 |
Balance, September 30, 2013 | 187,884 | ' | 187,884 | ' |
Common Stock [Member] | ' | ' | ' | ' |
Balance, December 31, 2012 | ' | ' | 10,831 | ' |
Net earnings | ' | ' | 0 | ' |
Foreign currency translation adjustments | ' | ' | 0 | ' |
Pension liability adjustment, net of tax | ' | ' | 0 | ' |
Cash dividends declared | ' | ' | 0 | ' |
Cash dividends declared to noncontrolling interest | ' | ' | 0 | ' |
Stock options exercised | ' | ' | 201 | ' |
Stock-based compensation expense | ' | ' | 0 | ' |
Income tax benefit from stock options exercised | ' | ' | 0 | ' |
Shares purchased and retired | ' | ' | -195 | ' |
Balance, September 30, 2013 | 10,837 | ' | 10,837 | ' |
Capital in Excess of Par Value [Member] | ' | ' | ' | ' |
Balance, December 31, 2012 | ' | ' | 26,184 | ' |
Net earnings | ' | ' | 0 | ' |
Foreign currency translation adjustments | ' | ' | 0 | ' |
Pension liability adjustment, net of tax | ' | ' | 0 | ' |
Cash dividends declared | ' | ' | 0 | ' |
Cash dividends declared to noncontrolling interest | ' | ' | 0 | ' |
Stock options exercised | ' | ' | 3,357 | ' |
Stock-based compensation expense | ' | ' | 948 | ' |
Income tax benefit from stock options exercised | ' | ' | 514 | ' |
Shares purchased and retired | ' | ' | 0 | ' |
Balance, September 30, 2013 | 31,003 | ' | 31,003 | ' |
Reinvested Earnings [Member] | ' | ' | ' | ' |
Balance, December 31, 2012 | ' | ' | 149,664 | ' |
Net earnings | ' | ' | 10,797 | ' |
Foreign currency translation adjustments | ' | ' | 0 | ' |
Pension liability adjustment, net of tax | ' | ' | 0 | ' |
Cash dividends declared | ' | ' | -3,896 | ' |
Cash dividends declared to noncontrolling interest | ' | ' | 0 | ' |
Stock options exercised | ' | ' | 0 | ' |
Stock-based compensation expense | ' | ' | 0 | ' |
Income tax benefit from stock options exercised | ' | ' | 0 | ' |
Shares purchased and retired | ' | ' | -4,428 | ' |
Balance, September 30, 2013 | 152,137 | ' | 152,137 | ' |
Accumulated Other Comprehensive Income (Loss) [Member] | ' | ' | ' | ' |
Balance, December 31, 2012 | ' | ' | -12,514 | ' |
Net earnings | ' | ' | 0 | ' |
Foreign currency translation adjustments | ' | ' | -951 | ' |
Pension liability adjustment, net of tax | ' | ' | 770 | ' |
Cash dividends declared | ' | ' | 0 | ' |
Cash dividends declared to noncontrolling interest | ' | ' | 0 | ' |
Stock options exercised | ' | ' | 0 | ' |
Stock-based compensation expense | ' | ' | 0 | ' |
Income tax benefit from stock options exercised | ' | ' | 0 | ' |
Shares purchased and retired | ' | ' | 0 | ' |
Balance, September 30, 2013 | -12,695 | ' | -12,695 | ' |
Noncontrolling Interest [Member] | ' | ' | ' | ' |
Balance, December 31, 2012 | ' | ' | 7,224 | ' |
Net earnings | ' | ' | 194 | ' |
Foreign currency translation adjustments | ' | ' | -606 | ' |
Pension liability adjustment, net of tax | ' | ' | 0 | ' |
Cash dividends declared | ' | ' | 0 | ' |
Cash dividends declared to noncontrolling interest | ' | ' | -210 | ' |
Stock options exercised | ' | ' | 0 | ' |
Stock-based compensation expense | ' | ' | 0 | ' |
Income tax benefit from stock options exercised | ' | ' | 0 | ' |
Shares purchased and retired | ' | ' | 0 | ' |
Balance, September 30, 2013 | $6,602 | ' | $6,602 | ' |