Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	$ 197,954
Net earnings	3,592us-gaap_ProfitLoss	3,250us-gaap_ProfitLoss
Foreign currency translation adjustments	(1,597)	84
Pension liability adjustment, net of tax	271
Balance, March 31, 2015	198,659
Common Stock [Member]
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	10,821
Net earnings	0
Foreign currency translation adjustments	0
Pension liability adjustment, net of tax	0
Cash dividends declared	0
Stock options exercised	115
Stock-based compensation expense	0
Income tax benefit from stock options exercised	0
Shares purchased and retired	(85)
Balance, March 31, 2015	10,851
Capital in Excess of Par Value [Member]
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	37,966
Net earnings	0
Foreign currency translation adjustments	0
Pension liability adjustment, net of tax	0
Cash dividends declared	0
Stock options exercised	2,034
Stock-based compensation expense	360
Income tax benefit from stock options exercised	412
Shares purchased and retired	0
Balance, March 31, 2015	40,772
Reinvested Earnings [Member]
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	160,179
Net earnings	3,633
Foreign currency translation adjustments	0
Pension liability adjustment, net of tax	0
Cash dividends declared	(2,060)
Stock options exercised	0
Stock-based compensation expense	0
Income tax benefit from stock options exercised	0
Shares purchased and retired	(2,337)
Balance, March 31, 2015	159,415
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	(18,030)
Net earnings	0
Foreign currency translation adjustments	(1,337)
Pension liability adjustment, net of tax	271
Cash dividends declared	0
Stock options exercised	0
Stock-based compensation expense	0
Income tax benefit from stock options exercised	0
Shares purchased and retired	0
Balance, March 31, 2015	(19,096)
Noncontrolling Interest [Member]
Stockholders Equity Note [Line Items]
Balance, December 31, 2014	7,018
Net earnings	(41)
Foreign currency translation adjustments	(260)
Pension liability adjustment, net of tax	0
Cash dividends declared	0
Stock options exercised	0
Stock-based compensation expense	0
Income tax benefit from stock options exercised	0
Shares purchased and retired	0
Balance, March 31, 2015	$ 6,717

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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