Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 449,633	$ 428,503	$ 413,862	$ 415,363	$ 469,222	$ 460,227	$ 449,758	$ 425,708	$ 1,707,361	$ 1,804,915	$ 1,555,385
Operating income	1,363	3,282	8,787	12,638	21,142	22,892	20,018	14,854	26,070	78,906	28,608
Net income (loss)	$ (9,594)	$ (1,446)	$ 2,672	$ 4,721	$ 6,996	$ 16,129	$ 615	$ 1,159	$ (3,647)	$ 24,899	$ (4,060)
Basic earnings (loss) per share (in dollars per share)	$ (0.20)	$ (0.03)	$ 0.05	$ 0.10	$ 0.14	$ 0.33	$ 0.04	$ 0.18	$ (0.07)	$ 0.84	$ (0.64)
Diluted earnings (loss) per share (in dollars per share)	$ (0.20)	$ (0.03)	$ 0.05	$ 0.10	$ 0.14	$ 0.33	$ 0.04	$ 0.18	$ (0.07)	$ 0.83	$ (0.64)
Impairment of assets held for sale										$ (10,693)
Impairment of equity method investments					$ 1,800
Arnold [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for losses on receivables	$ 6,800
Xpress Internacional | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets held for sale	$ 10,700