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Unaudited Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020		Dec. 31, 2019
Fixed maturities available for sale, at amortized cost	$ 17,955,515		$ 16,598,808
Allowance for credit losses on investments	3,933		0
Short-term investments available for sale, at amortized cost	2,038,244		957,283
Collateral received under securities lending, at amortized cost	64,251		388,366
Securities pledged under securities lending, at amortized cost	62,662		378,738
Allowance for credit losses on premiums receivable	37,100		21,003
Allowance for credit losses on reinsurance recoverable	13,994		1,364
Allowance for credit losses on contractholder receivable	$ 5,902		$ 0
Common shares, par value per share	$ 0.0011		$ 0.0011
Common shares issued (shares)	578,024,671		574,617,195
Common shares held in treasury (shares)	172,005,713		168,997,994
Fixed maturities
Allowance for credit losses on investments	$ 3,933
Short-term investments
Allowance for credit losses on investments	0	[1]	$ 0
Short-term investments available for sale, at amortized cost	$ 2,038,244		$ 957,283
[1] Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.

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The amortized cost of fixed maturities and short-term investments pledged under securities lending agreements, as of the balance sheet date.

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