Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 215,734	$ 207,751	$ 423,532	$ 380,361
Income from Operations	16,435	14,796	28,563	25,427
Goodwill	77,389	75,691	77,389	75,691	$ 75,691
Total Identifiable Assets	665,237	632,886	665,237	632,886	$ 632,886
Industrial
Segment Reporting Information [Line Items]
Net Sales	118,521	105,476	235,433	183,187
Income from Operations	10,100	10,128	19,437	16,428
Goodwill	56,852	57,320	56,852	57,320
Total Identifiable Assets	378,159	367,096	378,159	367,096
Agricultural
Segment Reporting Information [Line Items]
Net Sales	52,981	53,635	101,438	104,443
Income from Operations	3,722	2,375	4,514	4,790
Goodwill	3,673	695	3,673	695
Total Identifiable Assets	131,118	113,286	131,118	113,286
European
Segment Reporting Information [Line Items]
Net Sales	44,232	48,640	86,661	92,731
Income from Operations	2,613	2,293	4,612	4,209
Goodwill	16,864	17,676	16,864	17,676
Total Identifiable Assets	$ 155,960	$ 152,504	$ 155,960	$ 152,504