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Investments (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 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		$ 4,600,542,000	$ 9,814,849,000
Gross unrealized losses on investments in unrealized loss position		144,892,000	367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		21,807,000	120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		123,085,000	247,060,000
Gross unrealized depreciation		0
Additional contractual commitments		$ 823,622,000
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		$ 4,600,542,000	9,814,849,000
Gross unrealized losses on investments in unrealized loss position		144,892,000	367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		21,807,000	120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		123,085,000	$ 247,060,000
Market value of investments		$ 15,804,524,000		$ 15,225,263,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member]
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			1.00%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member]
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			5.70%
Percentage threshold of unrealized losses not exceeded by any one single issuer		0.90%
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		$ 12,934,000	$ 74,729,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		106,852,000	230,560,000
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		$ 717,083,000

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