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Significant Accounting Policies Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Disaggregated Revenue
 
 
Three Months Ended 
 
 
March 31,
(In thousands)
 
2018
 
2017
LTL services
 
$
911,054

 
$
740,186

Other services
 
13,966

 
13,910

Total revenue from operations
 
$
925,020

 
$
754,096