XML 90 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plans (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total recognized in accumulated other comprehensive loss (gain) $ (791) $ (20,023) $ (4,560)
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net actuarial loss (gain) (545) 433  
Amortization of net actuarial loss (gain) (475) (499)  
Total recognized in accumulated other comprehensive loss (gain) (1,020) (66)  
Postretirement Benefit Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net actuarial loss (gain) (74) 1,586  
Settlement gain   (37,190)  
Curtailment - prior service cost   (38)  
Net actuarial loss settlement expense   15,606  
Amortization of net actuarial loss (gain) 317 97  
Amortization of prior service cost (14) (18)  
Total recognized in accumulated other comprehensive loss (gain) $ 229 $ (19,957)