Unaudited Interim Statements of Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Equity	Cumulative effect of adoption of accounting changes Retained Earnings		Cumulative effect of adoption of accounting changes Total Equity
Balance at Dec. 31, 2018		$ 2,000,000	$ 213,261,000	$ 243,827,000	$ (14,367,000)	$ 444,721,000	$ (336,000)	[1]	$ (336,000)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			0			0
Contributed (distributed) capital - parent/child asset transfers			0			0
Comprehensive income (loss):
Net income (loss)				10,545,000		10,545,000
Other comprehensive income (loss), net of tax					36,812,000	36,812,000
Total comprehensive income (loss)						47,357,000
Balance at Mar. 31, 2019		2,000,000	213,261,000	254,036,000	22,445,000	491,742,000
Balance at Dec. 31, 2018		2,000,000	213,261,000	243,827,000	(14,367,000)	444,721,000	(336,000)	[1]	(336,000)	[1]
Comprehensive income (loss):
Net income (loss)	$ 21,042,000
Other comprehensive income (loss), net of tax	73,364,000
Balance at Jun. 30, 2019		2,000,000	213,261,000	264,533,000	58,997,000	538,791,000
Balance at Mar. 31, 2019		2,000,000	213,261,000	254,036,000	22,445,000	491,742,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			0			0
Contributed (distributed) capital - parent/child asset transfers			0			0
Comprehensive income (loss):
Net income (loss)	10,497,000			10,497,000		10,497,000
Other comprehensive income (loss), net of tax	36,552,000				36,552,000	36,552,000
Total comprehensive income (loss)						47,049,000
Balance at Jun. 30, 2019		2,000,000	213,261,000	264,533,000	58,997,000	538,791,000
Balance at Dec. 31, 2019		2,000,000	268,021,000	280,246,000	85,635,000	635,902,000	(167,000)	[2]	(167,000)	[2]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			85,112,000			85,112,000
Contributed (distributed) capital - parent/child asset transfers			(4,268,000)			(4,268,000)
Comprehensive income (loss):
Net income (loss)				14,545,000		14,545,000
Other comprehensive income (loss), net of tax					(16,565,000)	(16,565,000)
Total comprehensive income (loss)						(2,020,000)
Balance at Mar. 31, 2020		2,000,000	348,865,000	294,624,000	69,070,000	714,559,000
Balance at Dec. 31, 2019		2,000,000	268,021,000	280,246,000	85,635,000	635,902,000	$ (167,000)	[2]	$ (167,000)	[2]
Comprehensive income (loss):
Net income (loss)	24,907,000
Other comprehensive income (loss), net of tax	60,434,000
Balance at Jun. 30, 2020		2,000,000	348,735,000	304,986,000	146,069,000	801,790,000
Balance at Mar. 31, 2020		2,000,000	348,865,000	294,624,000	69,070,000	714,559,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributed capital			0			0
Contributed (distributed) capital - parent/child asset transfers			(130,000)			(130,000)
Comprehensive income (loss):
Net income (loss)	10,362,000			10,362,000		10,362,000
Other comprehensive income (loss), net of tax	$ 76,999,000				76,999,000	76,999,000
Total comprehensive income (loss)						87,361,000
Balance at Jun. 30, 2020		$ 2,000,000	$ 348,735,000	$ 304,986,000	$ 146,069,000	$ 801,790,000

[1] Includes the impact from the adoption of ASU 2017-08 and 2017-12. See Note 2 to the Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 for additional information.

[2] Includes the impact from the adoption of ASU 2016-13. See Note 2.