Selected Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Data

The following is an unaudited summary of quarterly results for the two years ended December 31, 2015. The information includes all adjustments (consisting of normal accruals) which management considers necessary for a fair presentation of the results of operations for these periods.

	Three Months Ended
	March 31,			June 30,			September 30,		December 31,
2015:
Premium income	$	742,056		$	752,484		$	748,109	756,071
Net investment income	191,596			194,823			193,213		194,319
Realized investment gains (losses)	119			2,613			5,140		(16,663	)
Total revenue	934,440			950,611			947,154		933,860
Policyholder benefits	497,775			508,316			501,156		508,965
Amortization of deferred acquisition costs	110,660			111,738			111,643		111,584
Pretax income from continuing operations	194,477			196,723			199,009		175,978
Income from continuing operations	130,778			132,527			133,858		119,130
Income from discontinued operations	(9,130		)	(5,417		)	11,528		13,826
Net income	121,648			127,110			145,386		132,956
Basic net income per common share
Continuing operations	1.03			1.05			1.08		0.97
Discontinued operations	(0.07		)	(0.04		)	0.09		0.11
Total basic net income per share	0.96			1.01			1.17		1.08
Diluted net income per common share
Continuing operations	1.02			1.04			1.06		0.96
Discontinued operations	(0.07		)	(0.04		)	0.09		0.11
Total diluted net income per share	0.95			1.00			1.15		1.07

2014(1):
Premium income	$	708,592		$	707,173	$	702,061		$	718,314
Net investment income	188,051			189,930		189,588			190,717
Realized investment gains (losses)	16,619			577		(1,483		)	7,835
Total revenue	913,743			898,343		890,834			917,175
Policyholder benefits	472,585			473,007		473,098			484,694
Amortization of deferred acquisition costs	104,028			103,889		103,084			104,913
Pretax income from continuing operations	209,037			191,922		184,709			199,009
Income from continuing operations	140,330			129,695		124,390			133,659
Income from discontinued operations	(7,474		)	1,228		8,022			13,089
Net income	132,856			130,923		132,412			146,748
Basic net income per common share
Continuing operations	1.05			0.99		0.96			1.04
Discontinued operations	(0.05		)	0.01		0.06			0.10
Total basic net income per share	1.00			1.00		1.02			1.14
Diluted net income per common share
Continuing operations	1.04			0.97		0.94			1.03
Discontinued operations	(0.06		)	0.01		0.06			0.10
Total diluted net income per share	0.98			0.98		1.00			1.13