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Debt (Narratives) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Line of Credit Facility [Line Items]        
New Credit Agreement 2017   $ 545,000,000    
Outstanding letters of credit   16,752,000    
Payments of financing costs   0 $ 0 $ (619,000)
Carrying amount of the Company's revolving credit facility $ 310,463,000 $ 259,350,000 $ 310,463,000  
Stated interest rate percentage 3.00% 2.50% 3.00%  
Debt Instrument, Term   7 years    
Line of Credit Facility, Expiration Period   5 years    
Long-term Debt, Current Maturities $ 65,000,000 $ 4,450,000 $ 65,000,000  
Line of Credit Facility, Fair Value of Amount Outstanding   0    
Gross balance of deferred costs 14,690,000   14,690,000  
Accumulated amortization balances 4,547,000 6,645,000 4,547,000  
Debt obligations   2,428,000    
Amount drawn on unsecured credit lines   0    
Debt Instrument, Unamortized Discount, Noncurrent (10,143,000) (8,044,000) (10,143,000)  
Long-term Debt (300,320,000) (251,306,000) (300,320,000)  
Minimum        
Line of Credit Facility [Line Items]        
Outstanding letters of credit   898,000    
Foreign Line of Credit        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   14,160,000    
Outstanding borrowings   9,958,000    
Line of Credit        
Line of Credit Facility [Line Items]        
Gross balance of deferred costs 2,789,000   2,789,000  
Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Outstanding letters of credit   15,854,000    
STAHL [Member]        
Line of Credit Facility [Line Items]        
Secured Debt, Current   4,450,000    
STAHL [Member] | Line of Credit        
Line of Credit Facility [Line Items]        
Secured Long-term Debt, Noncurrent   445,000,000    
STAHL [Member] | New Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Secured Long-term Debt, Noncurrent   100,000,000    
Accumulated amortization balances 1,209,000 1,766,000 $ 1,209,000  
STAHL [Member] | Other Current Liabilities [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Periodic Payment, Principal $ 65,000,000 $ 51,113,000