Consolidated Balance Sheets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 61,365	$ 5,678
Accounts receivable, net of allowance of $5,933 in 2019 and $1,854 in 2018	180,416	147,756
Other receivables	3,396	4,846
Prepaid expenses and other	10,942	44,167
Restricted cash	153	1,482
Current assets of discontinued operations	155	7,051
Total current assets	256,427	210,980
Operating lease assets	20,095	0
Property and equipment, net	23,243	22,965
Goodwill	135,216	135,216
Intangible assets, net	19,911	26,146
Equity investment	130,869	161,503
Other assets	11,620	9,949
Restricted cash, less current portion	0	2,886
Total assets	597,381	569,645
Current liabilities:
Current portion of long-term obligations	308	718
Accounts payable	9,805	8,828
Current portion of operating lease liabilities	6,730	0
Accrued expenses	38,733	39,191
Accrued transportation costs	87,063	84,889
Deferred revenue	227	562
Self-funded insurance programs	5,890	5,438
Current liabilities of discontinued operations	1,430	3,257
Total current liabilities	150,186	142,883
Long-term debt, less current portion	45	353
Operating lease liabilities, less current portion	14,502	0
Other long-term liabilities	15,029	14,970
Deferred tax liabilities	22,907	23,049
Total liabilities	202,669	181,255
Commitments and contingencies (Note 20)
Stockholders’ equity
Common stock: Authorized 40,000,000 shares; $0.001 par value; 18,073,763 and 17,784,769 issued and outstanding (including treasury shares)	18	18
Additional paid-in capital	351,529	334,744
Retained earnings	183,733	187,127
Treasury shares, at cost, 5,088,782 and 4,970,093 shares, respectively	(217,688)	(210,891)
Total stockholders’ equity	317,592	310,998
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	597,381	569,645
Allowance for credit loss	$ 5,933	$ 1,854
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, par (in USD per share)	$ 0.001	$ 0.001
Common stock, shares, issued (in shares)	18,073,763	17,784,769
Common stock, shares, outstanding (in shares)	18,073,763	17,784,769
Treasury stock (in shares)	5,088,782	4,970,093
Convertible Preferred Stock
Redeemable convertible preferred stock
Convertible preferred stock, net: Authorized 10,000,000 shares; $0.001 par value; 798,788 and 801,606 issued and outstanding; 5.5%/8.5% dividend rate	$ 77,120	$ 77,392
Stockholders’ equity
Temporary equity, shares authorized (in shares)	10,000,000	10,000,000
Temporary equity, par (in USD per share)	$ 0.001	$ 0.001
Temporary equity, shares issued (in shares)	798,788	801,606
Temporary equity, shares outstanding (in shares)	798,788	801,606
Convertible Preferred Stock | Cash Dividends
Stockholders’ equity
Convertible preferred stock, dividend rate	5.50%	8.50%