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Subsequent Events (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 30, 2017
Jan. 09, 2017
Jan. 03, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Events                            
Cash dividends declared per common share (in dollars per share)       $ 0.18 $ 0.18 $ 0.18 $ 0.160 $ 0.160 $ 0.160 $ 0.160 $ 0.140 $ 0.70 $ 0.62 $ 0.545
Earn-out liability                       $ 27,000 $ 1,177,000 $ 1,293,000
Subsequent Event                            
Subsequent Events                            
Cash dividends declared per common share (in dollars per share) $ 0.18                          
Dividends $ 8,600,000                          
Acquisition of Gbo Fastening Systems AB | Subsequent Event                            
Subsequent Events                            
Cash paid for acquisition     $ 10,200,000                      
Acquisition of CG Visions, Inc. | Subsequent Event                            
Subsequent Events                            
Cash paid for acquisition   $ 21,500,000                        
Earn-out liability   $ 2,150,000