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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2016
Fair Value of Financial Instruments [Abstract]  
Available-for-sale Securities



 

 

 

 

 



 

 



June 30,

 

December 31,



2016

 

2015

Amortized cost

$

455,084 

 

$

1,040,850 

Gross unrealized gains (losses)

 

1,464 

 

 

(2,712)

Fair market value

$

456,548 

 

$

1,038,138 



Unrealized Gains (Losses) on Investments held in Rabbi Trust



 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 



Three months ended

June 30,

 

Six months ended

June 30,



2016

 

2015

 

2016

 

2015

Unrealized gains (losses) on investments held in rabbi trust

$

183 

 

$

116 

 

$

286 

 

$

256