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Accumulated Other Comprehensive Loss (Details) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity $ 1,156,494,000 $ 1,095,831,000 $ 1,112,790,000 $ 1,233,120,000 $ 1,193,238,000 $ 1,178,610,000
Reclassification from accumulated other comprehensive loss into earnings 0 0        
Cumulative translation adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity (27,189,000) (26,878,000)        
Unrecognized net gain on pension plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity 1,131,000 1,131,000        
Accumulated other comprehensive income, accumulated tax 300,000 300,000        
Accumulated other comprehensive loss, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity $ (26,058,000) $ (25,747,000) $ (29,555,000) $ (26,454,000) $ (24,434,000) $ (19,315,000)