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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized cost	$ 36,773,458	$ 35,900,332
Fair value	38,477,672	36,487,216
NAIC, Class 1 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	23,648,794	23,363,259
Fair value	25,264,168	24,207,801
NAIC, Class 2 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	11,955,752	11,709,730
Fair value	12,223,107	11,589,325
NAIC, Class 3 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	1,023,746	758,531
Fair value	894,557	643,293
NAIC, Class 4 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	128,238	60,480
Fair value	86,816	44,312
NAIC, Class 5 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	2,100	0
Fair value	1,537	0
NAIC, Class 6 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	14,828	8,332
Fair value	$ 7,487	$ 2,485

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