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Significant Accounting Policies Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2017
Accounting Policies [Abstract]  
Disaggregated Revenue [Table Text Block]
 
 
Three Months Ended 
 
 
March 31,
(In thousands)
 
2017
 
2016
LTL services
 
$
740,186

 
$
694,533

Other services
 
13,910

 
13,200

Total revenue
 
$
754,096

 
$
707,733