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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Debt Instrument [Line Items]    
Document Fiscal Year (linked throughout the document) - not tagged   2020
Accumulated amortization balances $ 4,547,000 $ 6,645,000
Debt Instrument, Term   7 years
Line of Credit Facility, Expiration Period   5 years
Long-term Debt, Gross 310,463,000 $ 259,350,000
Outstanding borrowings (10,143,000) (8,044,000)
Long-term Debt 300,320,000 251,306,000
Current portion of long-term debt 65,000,000 4,450,000
Long-term Debt, Excluding Current Maturities 235,320,000 246,856,000
Maturities of Long-term Debt [Abstract]    
2015   4,450,000
2016   4,450,000
2017   4,450,000
2018   246,000,000
Thereafter   0
STAHL [Member] | New Revolving Credit Facility    
Debt Instrument [Line Items]    
Accumulated amortization balances 1,209,000 1,766,000
STAHL [Member] | Other Current Liabilities [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Periodic Payment, Principal $ 65,000,000 $ 51,113,000