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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of Investments Measured at Fair Value
The following is a summary of our investments measured at fair value at June 30, 2018:
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In thousands)
Equity securities
 
 
 
 
 
 
 
 
Equities
 
$
2,366

 
$
—

 
$
2,366

 
$
—

Mutual funds
 
4,933

 
—

 
4,933

 
—

Available-for-sale securities
 
 
 
 
 
 
 
 
U.S. Government and agency securities
 
1,824

 
1,824

 
—

 
—

Corporate bonds
 
1,493

 
1,493

 
—

 
—

Asset-backed securities and collateralized mortgage obligations
 
140

 
—

 
140

 
—

Total
 
$
10,756

 
$
3,317

 
$
7,439

 
$
—

The following is a summary of our investments measured at fair value at December 31, 2017:
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In thousands)
Available-for-sale securities
 
 
 
 
 
 
 
 
U.S. Government and agency securities
 
$
1,299

 
$
1,299

 
$
—

 
$
—

Corporate bonds
 
3,169

 
1,534

 
1,635

 
—

Equities
 
2,759

 
—

 
2,759

 
—

Mutual funds
 
4,847

 
—

 
4,847

 
—

Asset-backed securities and collateralized mortgage obligations
 
161

 
—

 
161

 
—

Total
 
$
12,235

 
$
2,833

 
$
9,402

 
$
—