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Business Acqusition Business Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 04, 2019
Feb. 11, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]                          
Business combination, consideration transferred $ 13,900                        
Payments to acquire business   $ 365,000                      
Business Acquisition, Goodwill, Expected Tax Deductible Amount   215,800                      
Business Combination, Acquisition Related Costs     $ 1,900 $ 1,700 $ 3,000 $ 7,900 $ 1,300 $ 1,100       $ 1,100  
Revenues     264,865 $ 233,590 $ 238,263 $ 218,378 242,444 $ 202,307 $ 212,820 $ 202,064 $ 955,097 859,634 $ 796,392
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   119                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   4,587                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   4,582                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other   146                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets   9,434                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   4,036                      
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets   80                      
Goodwill     $ 618,042       $ 400,440       618,042 400,440 401,954
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets   166                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   369,509                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities   4,462                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   4,462                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   365,047                      
Pro Forma Information [Abstract]                          
Business Acquisition, Pro Forma Revenue                     960,115 898,545  
Business Acquisition, Pro Forma Net Income (Loss)                     44,361 10,407  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 4,100                        
Goodwill, Acquired During Period $ 1,700 $ 215,800                 217,482 0  
Buffalo Filter LLC [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   16 years                      
Revenues                     49,600    
Goodwill   $ 215,793                      
Customer Relationships [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 124,000                      
Customer Relationships [Member] | Buffalo Filter LLC [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   16 years                      
Technology-Based Intangible Assets [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 9,000                      
Technology-Based Intangible Assets [Member] | Buffalo Filter LLC [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years                      
Trademarks and Trade Names [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 7,000                      
Trademarks and Trade Names [Member] | Buffalo Filter LLC [Member]                          
Business Acquisition [Line Items]                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   20 years                      
Selling and Administrative Expenses [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition Related Costs                     13,066 2,372 2,336
Selling and Administrative Expenses [Member] | Buffalo Filter LLC [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition Related Costs                     13,100 1,300  
Cost of Sales [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition Related Costs                     $ 1,335 0 $ 0
Pro Forma [Member] | Selling and Administrative Expenses [Member] | Acquisition-related Costs [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition Related Costs                       13,100  
Pro Forma [Member] | Cost of Sales [Member] | Acquisition-related Costs [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition Related Costs                       $ 1,300