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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In thousands)
Assets:
 
 

 
 

 
 

 
 

Investments in marketable securities
 
$
205,646

 
$
49,742

 
$
155,904

 
$
—

Derivatives
 
8,680

 
2,893

 
977

 
4,810

Total assets
 
$
214,326

 
$
52,635

 
$
156,881

 
$
4,810

Liabilities:
 
 
 
 
 
 
 
 
Derivatives
 
$
476

 
$
437

 
$
—

 
$
39
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, 2016
 
Six Months Ended June 30, 2016
 
 
(In thousands)
Balance, beginning of period
 
$
2,702

 
$
2,432

Realized and unrealized gains recognized in earnings, net
 
1,061

 
202

Realized and unrealized gains recognized in other comprehensive income, net
 
—

 
—

Purchases
 
2,073

 
3,435

Issuances
 
(255
)
 
(488
)
Settlements
 
(810
)
 
(810
)
Ending balance
 
$
4,771

 
$
4,771