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Subsequent Events (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired $ 68,557 $ 27,188 $ 1,561,737
Belanger [Member]      
Subsequent Event [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired $ 180,000