Stockholders Equity AOCI Reclassifications table (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net realized capital gains on sales of investments		$ 377	$ 841	$ 10,534	$ (906)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Net of Tax, Attributable to Parent		$ 145,925	$ (22,727)	277,816	(92,054)
reclassifications out of accumulated other comprehensive income
Net realized capital gains on sales of investments				(2,833)	(1,795)
Change in offsets to unrealized on investments				143	(8)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, before Tax				530	668
Other Compreshensive Income (Loss), Reclassification Adjustment from AOCi, before Tax				(2,160)	(1,135)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent				454	240
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Net of Tax, Attributable to Parent				(1,706)	(895)
reclassifications out of accumulated other comprehensive income | Accumulated Net Unrealized Investment Gain (Loss)
Net realized capital gains on sales of investments	[1]			(2,833)	(1,795)
Change in offsets to unrealized on investments	[1]			143	(8)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, before Tax				0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	[1]			(2,690)	(1,803)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	[1]			565	379
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	[1]			(2,125)	(1,424)
reclassifications out of accumulated other comprehensive income | Accumulated Other-than-Temporary Impairment
Net realized capital gains on sales of investments	[1]			0	0
Change in offsets to unrealized on investments	[1]			0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, before Tax				0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	[1]			0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	[1]			0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	[1]			0	0
reclassifications out of accumulated other comprehensive income | Accumulated Defined Benefit Plans Adjustment
Net realized capital gains on sales of investments				0	0
Change in offsets to unrealized on investments				0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, before Tax				530	668
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Pension and Other Postretirement Benefit Plans, before Tax				530	668
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Pension and Other Postretirement Benefit Plans, Tax				(111)	(139)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax				$ 419	$ 529

[1] See Note 2 to our consolidated financial statements for further information.