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

 
 

 
 

 
 

Investments in marketable securities
 
$
113,150

 
$
1,699

 
$
111,451

 
$
—

Derivatives
 
6,153

 
1,960

 
220

 
3,973

Total assets
 
$
119,303

 
$
3,659

 
$
111,671

 
$
3,973

Liabilities:
 
 
 
 
 
 
 
 
Derivatives
 
$
355

 
$
224

 
$
—

 
$
131
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, 2016
 
Nine Months Ended September 30, 2016
 
 
(In thousands)
Balance, beginning of period
 
$
4,771

 
$
2,432

Realized and unrealized gains recognized in earnings, net
 
(1,888
)
 
(1,686
)
Realized and unrealized gains recognized in other comprehensive income, net
 
—

 
—

Purchases
 
1,586

 
5,021

Issuances
 
—

 
(488
)
Settlements
 
(627
)
 
(1,437
)
Ending balance
 
$
3,842

 
$
3,842