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Segment Reporting (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Reconciliation of earnings before taxes to segment profit      
Earnings before taxes $ 125,676 $ 117,439  
Amortization 12,222 11,735  
Interest Expense 9,094 8,359  
Restructuring Charges 1,523 4,413 $ 4,400
Other charges (income), net (674) (2,400)  
Segment Profit Information $ 147,841 $ 139,546