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Acquisitions (Details 1)
 3 Months Ended 12 Months Ended
Apr. 06, 2017
USD ($)
Sep. 01, 2016
USD ($)
Jul. 28, 2016
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                            
Goodwill       $ 21,065,000       $ 16,803,000       $ 186,044,000 $ 21,065,000 $ 16,803,000
Intangible Assets Subject to Amortization:                       159,445,000    
Amortization expense                       17,054,000 409,000 1,481,000
Net Sales       279,295,000 $ 261,921,000 $ 270,791,000 $ 191,059,000 211,746,000 $ 200,134,000 $ 216,828,000 $ 179,864,000 1,003,066,000 808,572,000 811,799,000
Net Earnings       (3,206,000) $ 3,559,000 $ (2,591,000) $ (3,957,000) $ 15,370,000 $ 11,477,000 $ 15,328,000 $ 4,439,000 (6,195,000) 46,614,000 $ 32,088,000
Senior Secured Credit Facility                            
Business Acquisition [Line Items]                            
Long-term Line of Credit, Noncurrent $ 420,000,000                          
IP Cleaning S.p.A                            
Business Acquisition [Line Items]                            
Business Acquisition, Percentage of Voting Interests Acquired 100.00%                          
Business Combination, Consideration Transferred $ 353,769,000                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 8,804,000                          
Goodwill 147,845,000                          
Business Acquisition, Goodwill, Expected Tax Deductible Amount 0                          
Intangible Assets Subject to Amortization: 159,445,000                          
Amortization expense                       15,746,000    
Net Sales                       174,444,000    
Net Earnings                       14,483,000    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory                       5,237,000    
Business Combination, Acquisition Related Costs                       10,408,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Gross                       44,654,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Uncollectible                       4,670,000    
Business Combination, Purchase Accounting Adjustment, Inventory Step Up Adjustment                       $ 7,245,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 117,631,000                          
Crawford Laboratories, Inc.                            
Business Acquisition [Line Items]                            
Business Combination, Consideration Transferred     $ 11,843,000                      
Business Acquisition, Effective Date of Acquisition     Jul. 28, 2016                      
Business Acquisition, Name of Acquired Entity     Crawford Laboratories, Inc. and affiliates thereof ("Sellers")                      
Payments to Acquire Businesses, Gross     $ 10,965,000                      
Payments to Acquire Businesses, Deferred     $ 878,000                      
Business Acquisition, Number of Deferred Payments     2                      
Business Acquisition, Amount of first deferred payment       $ 575,000                 $ 575,000  
Dofesa Barrido Mecanizado                            
Business Acquisition [Line Items]                            
Business Combination, Consideration Transferred   $ 4,650,000                        
Business Acquisition, Effective Date of Acquisition   Sep. 01, 2016                        
Business Acquisition, Name of Acquired Entity   Dofesa Barrido Mecanizado ("Dofesa")                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 3,448,000                        
Business Combination, Consideration Transferred, Net   1,202,000                        
Business Acquisition, Transaction Costs   $ 191,000                        
Customer Lists                            
Business Acquisition [Line Items]                            
Weighted-average original life (in years)                       15 years 15 years  
Customer Lists | IP Cleaning S.p.A                            
Business Acquisition [Line Items]                            
Intangible Assets Subject to Amortization: $ 123,061,000                          
Weighted-average original life (in years) 15 years                          
Trade Name                            
Business Acquisition [Line Items]                            
Weighted-average original life (in years)                       10 years 15 years  
Trade Name | IP Cleaning S.p.A                            
Business Acquisition [Line Items]                            
Intangible Assets Subject to Amortization: $ 26,753,000                          
Weighted-average original life (in years) 10 years                          
Technology                            
Business Acquisition [Line Items]                            
Weighted-average original life (in years)                       11 years 13 years  
Technology | IP Cleaning S.p.A                            
Business Acquisition [Line Items]                            
Intangible Assets Subject to Amortization: $ 9,631,000                          
Weighted-average original life (in years) 10 years