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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Measurements [Abstract]  
Schedule of balance of assets and liabilities measured at fair value on a recurring basis
  Level 1 (1)  Level 2 (2)  Level 3 (3)  Total 
  (in thousands) 
September 30, 2018            
Assets:            
Derivative contracts $1,701  $784  $    —  $2,485 
Liabilities:                
Derivative contracts $589  $112  $  $701 
December 31, 2017                
Assets:                
Derivative contracts $3,091  $1,267  $  $4,358 
Liabilities:                
Derivative contracts $693  $535  $  $1,228 

 

(1) – quoted prices in active markets for identical assets or liabilities

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

(3) – no observable pricing inputs in the market