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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Mortgage loans on real estate, allowance for credit losses	$ 26,581	$ 28,514	$ 31,029	$ 20,089	$ 19,776		$ 17,779
Coinsurance deposits, allowance for credit losses	1,779		1,888
Retained earnings	$ 2,574,707		$ 2,368,555
Accounting Standards Update 2016-13 \| Cumulative Effect, Period of Adoption, Adjustment
Mortgage loans on real estate, allowance for credit losses						$ 8,600
Coinsurance deposits, allowance for credit losses						3,200
Retained earnings						$ (9,300)

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

The cumulative amount of the reporting entity's undistributed earnings or deficit.