XML 58 R46.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financial Instruments - Fair value of financial assets and liabilties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Document Period End Date Sep. 30, 2018          
Fair Value, Measurements, Recurring [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset $ 154   $ 2,564      
Derivative Liability 4,180   2,596      
Derivative Assets (Liabilities), at Fair Value, Net (4,026)   (32)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset 99   602      
Derivative Liability, Fair Value, Gross Liability 3,242   1,970      
Derivative Assets (Liabilities), at Fair Value, Net (3,143)   (1,368)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset 0   2,564      
Derivative Liability, Fair Value, Gross Liability 1,037   0      
Derivative Assets (Liabilities), at Fair Value, Net (1,037)   2,564      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset 154   0      
Derivative Liability, Fair Value, Gross Liability 0   1,228      
Derivative Assets (Liabilities), at Fair Value, Net 154   (1,228)      
Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Liability (99)   (602)      
Derivative Liability, Fair Value, Gross Asset (99)   (602)      
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset 0   0      
Derivative Liability 3,143   1,368      
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 1 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset 99   602      
Derivative Asset, Fair Value, Gross Liability (99)   (602)      
Derivative Liability, Fair Value, Gross Liability 3,242   1,970      
Derivative Liability, Fair Value, Gross Asset (99)   (602)      
Foreign Exchange Forward [Member] | Fair Value, Measurements, Recurring [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset     2,564      
Derivative Liability 1,037          
Foreign Exchange Forward [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset     2,564      
Derivative Liability, Fair Value, Gross Liability 1,037          
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Assets (Liabilities), at Fair Value, Net 154 $ 110 (1,228) $ (2,657) $ 0 $ 0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset 154          
Derivative Liability     1,228      
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value of Financial Assets and Liabilities            
Derivative Asset, Fair Value, Gross Asset $ 154          
Derivative Liability, Fair Value, Gross Liability     $ 1,228