Segment Reporting Information - Operations and Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 23, 2016 USD ($)	Sep. 25, 2015 USD ($)	Sep. 23, 2016 USD ($) segment	Sep. 25, 2015 USD ($)	Dec. 25, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Net Sales	$ 327,192	$ 318,986	$ 980,230	$ 960,928
Operating Earnings	81,464	76,927	220,755	226,049
Assets	1,421,202		1,421,202		$ 1,391,352
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Net Sales	150,893	152,164	454,978	448,932
Operating Earnings	50,573	50,822	147,419	144,500
Assets	558,228		558,228		558,799
Operating Segments | Process
Segment Reporting Information [Line Items]
Net Sales	67,077	64,710	196,068	204,337
Operating Earnings	10,394	10,437	25,305	34,923
Assets	513,186		513,186		481,677
Operating Segments | Contractor
Segment Reporting Information [Line Items]
Net Sales	109,222	102,112	329,184	307,659
Operating Earnings	25,593	24,135	71,700	70,550
Assets	212,958		212,958		205,632
Unallocated corporate
Segment Reporting Information [Line Items]
Operating Earnings	(5,096)	$ (8,467)	(23,669)	$ (23,924)
Assets	$ 136,830		$ 136,830		$ 145,244