Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Narrative) (Details)

v3.8.0.1
Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Maximum net exposure to counterparty     $ 1,353  
Sales $ 45,774 $ 39,441 118,010 $ 106,790
Other, net 213 422 435 826
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]        
Sales $ (422) (152) $ (36) (495)
Other, net   $ 34   $ (8)