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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Investments in available-for-sale securities were classified as follows:
 
June 30,
2015
 
December 31,
2014
Non-current
$
5,074

 
$
15,414

Total available-for-sale securities
$
5,074

 
$
15,414

Available-for-sale Securities
The cost, gross unrealized gains, gross unrealized losses and fair value of the Company's available-for-sale securities were as follows:
 
 
June 30, 2015
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Equity securities
 
$
3,802

 
$
1,272

 
$

 
$
5,074

Total available-for-sale securities
 
$
3,802

 
$
1,272

 
$

 
$
5,074

 
 
December 31, 2014
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Equity securities
 
$
15,050

 
$
364

 
$

 
$
15,414

Total available-for-sale securities
 
$
15,050

 
$
364

 
$

 
$
15,414

Schedule of Realized Gain (Loss)
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Proceeds from sales and maturities of securities
 
$
15,037

 
$
311,926

 
$
15,037

 
$
342,045

Gross realized gains
 
3,795

 
1,298

 
3,795

 
1,311

Gross realized losses
 

 
(61
)
 

 
(99
)