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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
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: 
 
 
September 30, 2017
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In thousands)
Assets:
 
 

 
 

 
 

 
 

Investments in marketable securities
 
$
154,629

 
$
60,896

 
$
93,733

 
$
—

Derivatives
 
2,268

 
—

 
237

 
2,031

Total assets
 
$
156,897

 
$
60,896

 
$
93,970

 
$
2,031

Liabilities:
 
 
 
 
 
 
 
 
Derivatives
 
$
2,296

 
$
2,305

 
$
34

 
$
(43
)
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 September 30, 2017
 
Nine Months Ended September 30, 2017
 
 
(In thousands)
Balance, beginning of period
 
$
698

 
$
4,537

Realized and unrealized gains recognized in earnings, net
 
644

 
(4,756
)
Purchases
 
891

 
3,444

Issuances
 
(16
)
 
(515
)
Settlements
 
(143
)
 
(636
)
Ending balance
 
$
2,074

 
$
2,074