Quarterly report pursuant to Section 13 or 15(d)

fair value of the Company's derivative financial instruments (Details)

v3.19.2
fair value of the Company's derivative financial instruments (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Other Current Liabilities $ (60,688,000) $ (50,406,000)
Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Assets 8 139,000
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Current Liabilities (91,000) (5,000)
Not Designated as Hedging Instrument [Member] | Sell A U D Buy U S D Fwd Contract [Member] | Other Assets [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Assets 18,000
Not Designated as Hedging Instrument [Member] | Sell A U D Buy U S D Fwd Contract [Member] | Other Current Liabilities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Current Liabilities   (1,000)
Not Designated as Hedging Instrument [Member] | Sell C A D Buy U S D Fwd Contract [Member] | Other Assets [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Assets 8,000 121,000
Not Designated as Hedging Instrument [Member] | Sell C A D Buy U S D Fwd Contract [Member] | Other Current Liabilities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Current Liabilities $ (91,000) $ (4,000)