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Goodwill and Intangible Assets (Intangible Assets Acquired from Business Acquisitions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 64,007 $ 84,658
Accumulated Amortization (38,024) (42,132)
Total 25,983 42,526
TL    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,508 23,461
Accumulated Amortization (3,980) (11,820)
Total 528 11,641
LTL    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 800 2,498
Accumulated Amortization (800) (1,925)
Total 0 573
Ascent TM    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,152 27,152
Accumulated Amortization (19,534) (17,248)
Total 7,618 9,904
Ascent OD    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 31,547 31,547
Accumulated Amortization (13,710) (11,139)
Total $ 17,837 $ 20,408