Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Disaggregated Revenue) (Details)

v3.19.2
Significant Accounting Policies (Disaggregated Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Revenue from operations $ 1,060,666 $ 1,033,498 $ 2,051,448 $ 1,958,518
LTL Service Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from operations 1,047,208 1,018,491 2,023,771 1,929,545
Other Service Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from operations $ 13,458 $ 15,007 $ 27,677 $ 28,973