XML 83 R70.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accumulated Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales $ 406,143 $ 483,552 $ 690,193
Selling, general and administrative expenses 32,911 36,376 41,663
Accumulated Defined Benefit Plans Adjustment, Amortization of Unrecognized Net Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales 514 279 333
Selling, general and administrative expenses (39) 220 107
Accumulated Postretirement Plans Adjustment, Amortization of Unrecognized Net Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales     567
Selling, general and administrative expenses     80
Accumulated Postretirement Plans Adjustment Amortization Of Unrecognized Net Gain [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales (8) (80)  
Selling, general and administrative expenses (309) (17)  
Accumulated Postretirement Plans Adjustment, Amortization of Prior Service Cost [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of sales   14 37
Selling, general and administrative expenses $ 14 $ 4 $ 5