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Other Non-Operating Income (Tables)
 9 Months Ended
Sep. 30, 2017
Other Nonoperating Income (Expense) [Abstract]  
Summary of non-operating income
A summary of non-operating income (expense) is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
(in thousands)
2017
 
2016
 
2017
 
2016
Foreign currency gain (loss), net
$
1,414

 
$
(3,797
)
 
$
6,608

 
$
(33,324
)
(Loss) gain on sales of businesses
—

 
—

 
(342
)
 
18,931

Loss on write-downs of cost method investments
(200
)
 
(15,000
)
 
(200
)
 
(15,161
)
Gain on sale of land
—

 
—

 
—

 
34,072

Gain on sales of marketable equity securities (see Note 2)
—

 
—

 
—

 
6,256

Gain on the formation of a joint venture
—

 
—

 
—

 
3,232

Other, net
749

 
572

 
815

 
1,865

Total Other Non-Operating Income (Expense)
$
1,963

 
$
(18,225
)
 
$
6,881

 
$
15,871