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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2013
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
installment
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
installment
Sep. 30, 2018
May 31, 2018
EUR (€)
Jan. 31, 2013
EUR (€)
Amended and Restated Secured Revolving Credit Facility                
Total debt   $ 239,100,000 $ 200,800,000          
U.S Revolving Credit Facility | Letter of Credit                
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity     20,000,000          
German Revolving Credit Facility | Letter of Credit                
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity     $ 5,000,000          
Global Revolving Credit Facilities (variable rates) due December 2023                
Amended and Restated Secured Revolving Credit Facility                
Proceeds from borrowings       $ 293,000,000        
Global Revolving Credit Facilities (variable rates) due December 2023 | W.A. Sanders Coldenhove Holding B.V.                
Amended and Restated Secured Revolving Credit Facility                
Proceeds from borrowings       $ 31,000,000        
Senior notes | 2021 Senior Notes (5.25% fixed rate) due May 2021                
2021 Senior Notes                
Total term of notes 8 years              
Face amount $ 175,000,000              
Fixed rate of interest (as a percent) 5.25%   5.25%   5.25%      
Maximum cash dividends allowed to be paid     $ 25,000,000          
Net leverage ratio, threshold in which dividends can be issued and shares may be repurchased without limitation     2.5          
Amended and Restated Secured Revolving Credit Facility                
Total debt   $ 175,000,000.0 $ 175,000,000.0          
Senior notes | 2014 Senior Notes (7.375% fixed rate) retired June 2013                
2021 Senior Notes                
Total term of notes 10 years              
Fixed rate of interest (as a percent) 7.375%              
Amount of debt redeemed or repaid $ 70,000,000              
Secured debt | Letter of Credit                
Amended and Restated Secured Revolving Credit Facility                
Total debt outstanding     500,000          
Secured debt | Revolving bank credit facility (variable rates) due November 2017                
2021 Senior Notes                
Amount of debt redeemed or repaid $ 56,000,000              
Secured debt | U.S Revolving Credit Facility                
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity     150,000,000          
Secured debt | German Revolving Credit Facility                
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity     75,000,000          
Secured debt | Global Revolving Credit Facilities (variable rates) due December 2023                
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity     350,000,000          
Maximum borrowing capacity that may be increased     $ 125,000,000          
Facility fee on unused amount of Revolver commitment (as a percent)     0.25%          
Fixed charge coverage ratio required     1.1          
Period to be maintained for stock repurchase or dividend payment     60 days          
Period to be maintained for available borrowing capacity     60 days          
Borrowing availability to determine stock repurchases and dividend payments     $ 25,000,000          
Percentage of aggregate commitments to determine the stock repurchases and dividend payments     12.50%          
Total debt outstanding     $ 21,600,000          
Available credit     $ 173,500,000          
Weighted-average interest rate (as a percent)   2.90% 1.30%   1.30%      
Total debt   $ 57,900,000 $ 21,600,000          
Secured debt | Global Revolving Credit Facilities (variable rates) due December 2023 | Minimum                
Amended and Restated Secured Revolving Credit Facility                
Reference rate     0.00%          
Borrowing availability for not achieving the fixed charge coverage ratio     $ 35,000,000          
Percentage of aggregate commitments for not maintaining fixed charge coverage ratio     17.50%          
Secured debt | Global Revolving Credit Facilities (variable rates) due December 2023 | Maximum                
Amended and Restated Secured Revolving Credit Facility                
Borrowing availability for not achieving the fixed charge coverage ratio     $ 20,000,000          
Percentage of aggregate commitments for not maintaining fixed charge coverage ratio     10.00%          
Secured debt | Fourth Amended and Restated Credit Agreement                
Amended and Restated Secured Revolving Credit Facility                
Borrowing availability to determine stock repurchases and dividend payments     $ 28,000,000          
Percentage of aggregate commitments to determine the stock repurchases and dividend payments     12.50%          
Secured debt | Fourth Amended and Restated Credit Agreement | Minimum                
Amended and Restated Secured Revolving Credit Facility                
Borrowing availability to determine stock repurchases and dividend payments     $ 25,000,000          
Secured debt | Second German Loan Agreement (2.45% fixed rate) due in quarterly installments ending September 2022                
2021 Senior Notes                
Fixed rate of interest (as a percent)     2.45%   2.45%      
Amended and Restated Secured Revolving Credit Facility                
Maximum borrowing capacity | €               € 9,000,000.0
Interest rate on amounts outstanding (as a percent)     2.45%   2.45%      
Total debt   4,800,000 $ 3,500,000   € 3,100,000      
Secured debt | Third German Loan Agreement (1.45% fixed rate)                
2021 Senior Notes                
Face amount | €             € 5,000,000.0  
Fixed rate of interest (as a percent)     1.45%   1.45% 1.45%    
Amended and Restated Secured Revolving Credit Facility                
Total debt   4,900,000 $ 3,700,000   € 3,300,000      
Number of quarterly installments | installment     13   13      
Proceeds from German government subsidy   $ 900,000            
LIBOR | U.S Revolving Credit Facility | Minimum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     0.00%          
LIBOR | U.S Revolving Credit Facility | Maximum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     0.25%          
LIBOR | German Revolving Credit Facility | Minimum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     1.25%          
LIBOR | German Revolving Credit Facility | Maximum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     1.75%          
LIBOR | Secured debt | German Revolving Credit Facility | Minimum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     1.25%          
LIBOR | Secured debt | German Revolving Credit Facility | Maximum                
Amended and Restated Secured Revolving Credit Facility                
Debt instrument basis spread on variable rate (as a percent)     1.75%