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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2019
FAIR VALUE MEASUREMENTS  
Schedule of financial assets and liabilities measured at fair value

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Estimated Fair Value December 31, 2019

 

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Total

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Input Levels Used

 

​

    

Fair Value

    

Level 1

    

Level 2

    

    Level 3    

 

Cash and equivalents

​

$

138,960

​

$

138,960

​

$

—

​

$

—

​

Available for sale securities

​

 

177,292

​

 

3,588

​

 

173,704

​

 

—

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Foreign currency forward contracts

​

 

14

​

 

—

​

 

14

​

 

—

​

Commodity futures contracts, net

​

 

121

​

 

121

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—

​

 

—

​

Trading securities

​

 

76,183

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48,260

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27,923

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—

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Total assets measured at fair value

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$

392,570

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$

190,929

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$

201,641

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$

—

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​

​

​

​

​

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​

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​

​

​

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Estimated Fair Value December 31, 2018

 

​

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Total

​

Input Levels Used

 

​

    

Fair Value

    

Level 1

    

Level 2

    

    Level 3    

 

Cash and equivalents

​

$

110,899

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$

110,899

​

$

—

​

$

—

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Available for sale securities

​

 

183,289

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3,007

​

 

180,282

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—

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Foreign currency forward contracts

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(407)

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—

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(407)

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—

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Commodity futures contracts, net

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(587)

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(587)

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—

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—

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Trading securities

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62,260

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36,753

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25,507

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—

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Total assets measured at fair value

​

$

355,454

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$

150,072

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$

205,382

​

$

—

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Summary of the aggregate fair value, gross unrealized gains, gross unrealized losses, realized losses and amortized cost basis of investment portfolio by major security type

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December 31, 2019

 

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Amortized

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Fair

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Unrealized

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Realized

 

Available for Sale:

    

Cost

    

Value

    

Gains

    

Losses

    

Losses

 

Municipal bonds

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$

—

​

$

—

​

$

—

​

$

—

​

$

—

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Variable rate demand notes

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​

25,845

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​

25,845

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​

—

​

​

—

​

​

—

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Corporate bonds

​

 

139,803

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140,797

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994

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—

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—

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Government securities

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3,503

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3,588

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​

85

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—

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​

—

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Certificates of deposit

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​

6,978

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​

7,062

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​

84

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—

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—

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$

176,129

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$

177,292

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$

1,163

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$

—

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$

—

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December 31, 2018

 

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​

Amortized

​

Fair

​

Unrealized

​

Realized

 

Available for Sale:

    

Cost

    

Value

    

Gains

    

Losses

    

Losses

 

Municipal bonds

​

$

6,173

​

$

5,123

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$

—

​

$

(1,050)

​

$

—

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Variable rate demand notes

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​

20,195

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​

20,195

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​

—

​

​

—

​

​

—

​

Corporate bonds

​

 

149,795

​

 

148,863

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—

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(932)

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—

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Government securities

​

 

2,979

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3,007

​

​

28

​

 

—

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​

—

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Certificates of deposit

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6,148

​

​

6,101

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​

—

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(47)

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​

—

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$

185,290

​

$

183,289

​

$

28

​

$

(2,029)

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$

—

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