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Supplementary Data on Cash Flows
 12 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]  
Supplementary Data on Cash Flows Supplementary Data on Cash Flows

A reconciliation of net income to net cash provided by operating activities as presented in the Statements of Cash Flows is as follows for the years ended December 31:
(in thousands)
 
2019
 
2018
 
2017
 
 
 
 
 
 
 
Cash flows from operating activities:
 
 
 
 
 
 
Net income
 
$
316,821

 
$
288,224

 
$
196,999

Adjustments to reconcile net income to net cash provided by operating activities:
 
 
 
 
 
 
Depreciation and amortization
 
16,813

 
13,368

 
14,831

Deferred income tax expense (benefit)
 
3,349

 
(1,358
)
 
26,912

Other income tax expense (1)
 
—

 
—

 
10,095

Lease amortization expense
 
13,959

 
—

 
—

Realized (gains) losses and impairments on investments
 
(5,908
)
 
3,591

 
(1,152
)
Equity in (earnings) losses of limited partnerships
 
(660
)
 
822

 
(2,801
)
Loss (gain) on disposal of fixed assets
 
75

 
(3,047
)
 
98

Net amortization of bond premium
 
1,203

 
5,601

 
7,038

Decrease in deferred compensation
 
(1,541
)
 
(3,886
)
 
(2,681
)
Limited partnership distributions
 
1,931

 
7,173

 
5,128

Increase in receivables from affiliates
 
(19,505
)
 
(30,804
)
 
(39,788
)
(Increase) decrease in accrued investment income
 
(170
)
 
1,590

 
(516
)
Decrease (increase) in federal income taxes recoverable
 
7,700

 
21,738

 
(24,640
)
Decrease (increase) in prepaid pension
 
28,798

 
(47,335
)
 
(27,265
)
Increase in prepaid expenses and other assets
 
(11,338
)
 
(727
)
 
(7,636
)
(Decrease) increase in accounts payable and accrued expenses
 
(3,627
)
 
11,039

 
17,183

Increase in commissions payable
 
21,390

 
13,449

 
17,565

(Decrease) increase in accrued agent bonuses
 
(7,409
)
 
(19,066
)
 
7,756

Increase in contract liability
 
2,646

 
3,213

 
—

Net cash provided by operating activities
 
$
364,527

 
$
263,585

 
$
197,126


(1)
Other income tax expense for 2017 was impacted by the re-measurement of our deferred tax assets and liabilities due to the enactment of the TCJA on December 22, 2017, which reduced the corporate tax rate from 35% to 21% effective January 1, 2018.