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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 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   $ 0 $ 0 $ 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