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Pension and Postretirement Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits, Description [Abstract]  
Pension and Postretirement Plans PENSION AND POSTRETIREMENT PLANS
On March 22, 2018, the Company eliminated the accrual of pension benefits for certain Kaplan University employees related to their future service. As a result, the Company remeasured the accumulated and projected benefit obligation of the pension plan as of March 22, 2018, and the Company recorded a curtailment gain in the first quarter of 2018. The new measurement basis was used for the recognition of the Company’s pension benefit following the remeasurement. The curtailment gain on the Kaplan University transaction is included in the gain on the Kaplan University transaction and reported in Other income, net on the Condensed Consolidated Statement of Operations.
Defined Benefit Plans. The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
  
Three Months Ended June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
4,963

 
$
4,317

 
$
10,184

 
$
9,257

Interest cost
11,743

 
11,844

 
23,335

 
23,099

Expected return on assets
(30,285
)
 
(32,796
)
 
(61,123
)
 
(65,282
)
Amortization of prior service cost
825

 
36

 
1,234

 
78

Recognized actuarial loss (gain)
37

 
(2,974
)
 
—

 
(4,020
)
Net Periodic Benefit
(12,717
)
 
(19,573
)
 
(26,370
)
 
(36,868
)
Curtailment gain
—

 
—

 
—

 
(806
)
Special separation benefit expense
6,607

 
—

 
6,607

 
—

Total Benefit
$
(6,110
)
 
$
(19,573
)
 
$
(19,763
)
 
$
(37,674
)

In the second quarter of 2019, the Company recorded $6.6 million in expenses related to a Separation Incentive Program for certain Kaplan employees, which will be funded from the assets of the Company’s pension plan.
The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:
  
Three Months Ended June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
215

 
$
204

 
$
429

 
$
409

Interest cost
1,079

 
966

 
2,157

 
1,932

Amortization of prior service cost
84

 
78

 
169

 
156

Recognized actuarial loss
578

 
601

 
1,157

 
1,202

Net Periodic Cost
$
1,956

 
$
1,849

 
$
3,912

 
$
3,699


Defined Benefit Plan Assets. The Company’s defined benefit pension obligations are funded by a portfolio made up of a U.S. stock index fund, a relatively small number of stocks and high-quality fixed-income securities that are held by a third-party trustee. The assets of the Company’s pension plan were allocated as follows:
  
As of
  
June 30,
2019
 
December 31,
2018
  
 
U.S. equities
55
%
 
53
%
U.S. stock index fund
26
%
 
28
%
U.S. fixed income
13
%
 
13
%
International equities
6
%
 
6
%
  
100
%
 
100
%

The Company manages approximately 44% of the pension assets internally, of which the majority is invested in a U.S. stock index fund with the remaining investments in Berkshire Hathaway stock and short-term fixed income securities. The remaining 56% of plan assets are managed by two investment companies. The goal for the investments is to produce moderate long-term growth in the value of these assets, while protecting them against large decreases in value. Both investment managers may invest in a combination of equity and fixed-income securities and cash. The managers are not permitted to invest in securities of the Company or in alternative investments. One investment manager cannot invest more than 15% of the assets at the time of purchase in the stock of Alphabet and Berkshire Hathaway, no more than 25% of the assets it manages in specified international exchanges at the time the investment is made, and no less than 5% of the assets could be invested in fixed-income securities. The other investment manager cannot invest more than 20% of the assets at the time of purchase in the stock of Berkshire Hathaway, no more than 15% of the assets it manages in specified international exchanges, at the time the investment is made, and no less than 10% of the assets could be invested in fixed-income securities. Excluding the exceptions noted above, the investment managers cannot invest more than 10% of the assets in the securities of any other single issuer, except for obligations of the U.S. Government, without receiving prior approval from the Plan administrator.
In determining the expected rate of return on plan assets, the Company considers the relative weighting of plan assets, the historical performance of total plan assets and individual asset classes and economic and other indicators of future performance. In addition, the Company may consult with and consider the input of financial and other professionals in developing appropriate return benchmarks.
The Company evaluated its defined benefit pension plan asset portfolio for the existence of significant concentrations (defined as greater than 10% of plan assets) of credit risk as of June 30, 2019. Types of concentrations that were evaluated include, but are not limited to, investment concentrations in a single entity, type of industry, foreign country and individual fund. At June 30, 2019 and December 31, 2018, the pension plan held investments in one common stock and one U.S. stock index fund that exceeded 10% of total plan assets. These investments were valued at $1,000.1 million and $945.6 million at June 30, 2019 and December 31, 2018, respectively, or approximately 41% and 45%, respectively, of total plan assets.
Other Postretirement Plans. The total cost arising from the Company’s other postretirement plans consists of the following components:
  
Three Months Ended June 30
 
Six Months Ended June 30
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
268

 
$
—

 
$
536

Interest cost
72

 
169

 
144

 
339

Amortization of prior service credit
(1,840
)
 
(44
)
 
(3,681
)
 
(88
)
Recognized actuarial gain
(1,090
)
 
(921
)
 
(2,180
)
 
(1,843
)
Net Periodic Benefit
$
(2,858
)
 
$
(528
)
 
$
(5,717
)
 
$
(1,056
)