Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			3
Schedule of financial data of reportable segments
Revenues	$ 530,579	$ 483,417	$ 1,009,499	$ 949,963
Operating Income	(7,493)	1,226	(25,403)	8,302
Interest expense	28,355	5,695	34,880	11,303
Income before provision for income taxes	(45,675)	(4,469)	(70,110)	(3,001)
Depreciation and amortization	9,210	9,179	18,515	18,388
Capital expenditures, cash and non-cash	3,348	4,584	7,278	10,631
Total assets	944,427		944,427		$ 933,554
Operating Segments | Ascent
Schedule of financial data of reportable segments
Revenues	89,119	83,627	177,502	167,005
Operating Income	6,738	6,788	13,054	14,192
Depreciation and amortization	1,257	1,233	2,522	2,455
Capital expenditures, cash and non-cash	120	1,275	337	2,964
Total assets	292,449		292,449		302,164
Operating Segments | TL
Schedule of financial data of reportable segments
Revenues	321,168	282,225	605,015	555,569
Operating Income	3,667	(110)	3,434	3,688
Depreciation and amortization	6,571	6,700	13,238	13,442
Capital expenditures, cash and non-cash	2,216	1,856	5,625	4,994
Total assets	483,616		483,616		498,330
Operating Segments | LTL
Schedule of financial data of reportable segments
Revenues	121,968	122,346	230,744	236,699
Operating Income	(3,264)	781	(5,985)	2,526
Depreciation and amortization	953	865	1,914	1,734
Capital expenditures, cash and non-cash	387	1,303	631	2,414
Total assets	92,292		92,292		129,899
Corporate
Schedule of financial data of reportable segments
Operating Income	(14,634)	(6,233)	(35,906)	(12,104)
Depreciation and amortization	429	381	841	757
Capital expenditures, cash and non-cash	625	150	685	259
Total assets	76,632		76,632		4,189
Eliminations
Schedule of financial data of reportable segments
Revenues	(1,676)	$ (4,781)	(3,762)	$ (9,310)
Total assets	$ (562)		$ (562)		$ (1,028)