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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated statements of operations:
Current income taxes	$ 188,356	$ 57,412	$ 75,568
Deferred income taxes (benefits)	(46,730)	(10,408)	41,916
Total income tax expense included in consolidated statements of operations	141,626	47,004	117,484
Stockholders' equity:
Expense (benefit) relating to: change in net unrealized investment losses	177,162	74,471	(279,860)
Expense (benefit) relating to: share-based compensation		(527)	(3,649)
Total income tax expense (benefit) included in consolidated financial statements	$ 318,788	$ 120,948	$ (166,025)

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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