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Investments (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value	80.00%
Aggregate market value of investments in unrealized loss position	$ 7,719,536,000		$ 9,814,849,000
Gross unrealized losses on investments in unrealized loss position	195,377,000		367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	28,026,000		120,838,000
Gross unrealized depreciation	0
Additional contractual commitments	$ 797,896,000
Contractual commitments, investment period expiration date	Jan. 01, 2023
Reclassification of other invested assets to fixed maturity securities		$ 143,656,000
Reclassification of other invested assets to short-term investments		$ 243,864,000
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	$ 7,719,536,000		9,814,849,000
Gross unrealized losses on investments in unrealized loss position	195,377,000		367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	28,026,000		120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	167,351,000		247,060,000
Market value of investments	$ 15,513,287,000		$ 15,225,263,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer			1.00%
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	0.90%		5.70%
Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	$ 13,333,000		$ 230,560,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	153,285,000		74,729,000
Sub-prime and Alt-A Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized depreciation	0		$ 0
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Market value of investments	$ 507,584,000

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