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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of Financial Assets and Liabilities Accounted for at Fair Value
The table below sets forth, by level, the Company’s financial assets and liabilities that are recorded at fair value in the accompanying Condensed Consolidated Balance Sheet: 
 
 
June 30, 2018
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In thousands)
Assets:
 
 

 
 

 
 

 
 

Investments in marketable securities
 
$
160,894

 
$
54,832

 
$
106,062

 
$
—

Derivatives
 
12,031

 
593

 
4,786

 
6,652

Total assets
 
$
172,925

 
$
55,425

 
$
110,848

 
$
6,652

Liabilities:
 
 
 
 
 
 
 
 
Derivatives
 
$
26,069

 
$
24,862

 
$
638

 
$
569
Summary of Change in the Fair Values of Financial Instruments Categorized as Level 3
The following table summarizes the change in the fair values of financial instruments categorized as Level 3.
 
 
Three Months Ended June 30, 2018
 
Six Months Ended June 30, 2018
 
 
(In thousands)
Balance, beginning of period
 
$
4,969

 
$
5,426

Realized and unrealized gains recognized in earnings, net
 
3,628

 
3,653

Purchases
 
823

 
1,656

Issuances
 
(580
)
 
(654
)
Settlements
 
(2,757
)
 
(3,998
)
Ending balance
 
$
6,083

 
$
6,083