XML 128 R109.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefits Plans (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations $ 2,274,746 $ 2,202,472
Plans with pension obligations in excess of plan assets:    
PBO 1,812,062 1,779,351
ABO 1,788,384 1,754,168
Fair value of plan assets 1,395,790 1,323,751
United States    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 1,781,882 1,748,171
Plans with pension obligations in excess of plan assets:    
PBO 1,804,260 1,771,968
ABO 1,781,882 1,748,171
Fair value of plan assets 1,395,790 1,323,751
Foreign Plan    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 492,864 454,301
Plans with pension obligations in excess of plan assets:    
PBO 7,802 7,383
ABO 6,502 5,997
Fair value of plan assets $ 0 $ 0