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Discontinued Operations Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2018
Sep. 18, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of discontinued operations, net of taxes     $ 27,307 $ 0
United Life | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal group, cash consideration $ 280,000      
Disposal group, adjustment to consideration 21      
Proceeds from disposal of subsidiary 279,979      
Gain on sale of discontinued operations, net of taxes $ 27,307      
Transition services agreement duration   24 months