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(Intangible Assets Acquired from Business Acquisitions) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 1,600 $ 1,800 $ 5,100 $ 5,400  
Intangible assets          
Gross Carrying Amount 72,160   72,160   $ 84,658
Accumulated Amortization (41,166)   (41,166)   (42,132)
Net Carrying Value 30,994   30,994   42,526
LTL          
Intangible assets          
Gross Carrying Amount 800   800   2,498
Accumulated Amortization (800)   (800)   (1,925)
Net Carrying Value 0   0   573
Ascent          
Intangible assets          
Gross Carrying Amount 27,152   27,152   27,152
Accumulated Amortization (19,045)   (19,045)   (17,248)
Net Carrying Value 8,107   8,107   9,904
Active On-Demand          
Intangible assets          
Gross Carrying Amount 31,547   31,547   31,547
Accumulated Amortization (13,067)   (13,067)   (11,139)
Net Carrying Value 18,480   18,480   20,408
TL          
Intangible assets          
Gross Carrying Amount 12,661   12,661   23,461
Accumulated Amortization (8,254)   (8,254)   (11,820)
Net Carrying Value $ 4,407   $ 4,407   $ 11,641