Mortgage Loans (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Distribution Based on Carrying Amount of Mortgage Loans by Location

The distribution based on carrying amount of mortgage loans by location is as follows:

	December 31,
	2018		2017
East North Central	13.9	%	15.4	%
East South Central	2.8		3.1
Mountain	20.0		14.0
Pacific	16.2		16.5
South Atlantic	12.1		14.1
West South Central	27.2		29.8
Other	7.8		7.1
Total	100.0	%	100.0	%

Age Analysis of Past Due Loans

The age analysis of past due loans is shown below (in thousands):

	30-59 Days		60-89 Days		More Than						Total
December 31, 2018	Past Due		Past Due		90 Days		Total		Current		Amount			Percent
Industrial	$	—	$	—	$	—	$	—	$	761,294	$	761,294		14.8	%
Office	—		—		—		—		1,747,926		1,747,926			34.0
Retail	—		—		—		—		896,429		896,429			17.4
Other	—		4,000		18,888		22,888		1,717,503		1,740,391			33.8
Total	$	—	$	4,000	$	18,888	$	22,888	$	5,123,152	$	5,146,040		100.0	%
Allowance for loan losses											(21,333		)
Total, net of allowance											$	5,124,707
December 31, 2017
Industrial	$	4,985	$	—	$	—	$	4,985	$	781,385	$	786,370		16.5	%
Office	—		10,713		8,881		19,594		1,764,151		1,783,745			37.4
Retail	—		—		—		—		750,979		750,979			15.7
Other	—		—		—		—		1,447,771		1,447,771			30.4
Total	$	4,985	$	10,713	$	8,881	$	24,579	$	4,744,286	$	4,768,865		100.0	%
Allowance for loan losses											(18,866		)
Total, net of allowance											$	4,749,999

Change in Allowance for Credit Losses in Mortgage Loans

The change in allowance for credit losses in mortgage loans is shown below (in thousands, except number of loans):

	Collectively Evaluated for Impairment						Individually Impaired							Total
	Number of Loans		Recorded Investment		Valuation Allowance		Number of Loans		Recorded Investment		Valuation Allowance			Number of Loans		Recorded Investment		Valuation Allowance
Balance at December 31, 2016	430		$	4,358,596	$	11,488	2		$	1,940	$	1,002		432		$	4,360,536	$	12,490
Change in allowance	—		—		4,553		—		—		1,823			—		—		6,376
Net change in recorded investment	21		403,719		—		1		4,610		—			22		408,329		—
Balance at December 31, 2017	451		4,762,315		16,041		3		6,550		2,825			454		4,768,865		18,866
Change in allowance	—		—		2,566		—		—		(99		)	—		—		2,467
Net change in recorded investment	(2	)	366,102		—		(1	)	11,073		—			(3	)	377,175		—
Balance at December 31, 2018	449		$	5,128,417	$	18,607	2		$	17,623	$	2,726		451		$	5,146,040	$	21,333

Schedule of Troubled Debt Restructuring Mortgage Loan Information

Troubled debt restructuring mortgage loan information is as follows (in thousands, except number of loans):

	Years ended December 31,
	2018					2017
	Number of loans	Recorded investment  pre-modification		Recorded investment  post modification		Number of loans	Recorded investment  pre-modification		Recorded investment  post modification
Office	1	$	5,164	$	5,164	2	$	34,207	$	34,207
Retail	1	42,448		42,448		—	—		—
Other (hotel/motel)	1	8,203		8,203		5	24,801		24,801
Total	3	$	55,815	$	55,815	7	$	59,008	$	59,008