Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Common Class A [Member]
Stockholders' equity:
Class A common stock, $.01 par value; 20,000,000 shares authorized; 15,922,879 shares issued 15,773,381 shares outstanding as of December 31, 2015; and 15,746,609 issued and outstanding as of December 31, 2014	$ 170	$ 168
Class B common stock, $.01 par value; 5,000,000 shares authorized; 2,350,000 shares issued and outstanding	170	168
Common Class B [Member]
Stockholders' equity:
Class A common stock, $.01 par value; 20,000,000 shares authorized; 15,922,879 shares issued 15,773,381 shares outstanding as of December 31, 2015; and 15,746,609 issued and outstanding as of December 31, 2014	24	24
Class B common stock, $.01 par value; 5,000,000 shares authorized; 2,350,000 shares issued and outstanding	24	24
Cash and cash equivalents	4,490	21,330
Accounts receivable, net of allowance of $1,857 in 2015 and $1,767 in 2014	112,669	95,943
Drivers' advances and other receivables, net of allowance of $1,005 in 2015 and $1,290 in 2014	8,779	5,770
Inventory and supplies	4,004	4,402
Prepaid expenses	8,678	9,028
Assets held for sale	25,626	4,268
Income taxes receivable	8,591	1,309
Total current assets	172,837	142,050
Property and equipment, at cost	596,071	505,345
Less: accumulated depreciation and amortization	(142,022)	(122,854)
Net property and equipment	454,049	382,491
Other assets, net	20,537	14,763
Total assets	647,423	$ 539,304
Checks outstanding in excess of bank balances	4,698
Accounts payable	12,272	$ 9,623
Accrued expenses	30,143	36,542
Current maturities of long-term debt	39,645	27,824
Current portion of capital lease obligations	4,031	1,606
Current portion of insurance and claims accrual	17,134	17,565
Other short-term liabilities	18,549	7,999
Total current liabilities	126,472	101,159
Long-term debt	196,513	159,531
Long-term portion of capital lease obligations	10,547	13,372
Insurance and claims accrual	22,300	23,173
Deferred income taxes	76,981	59,004
Other long-term liabilities	12,450	13,861
Total liabilities	$ 445,263	$ 370,100
Commitments and contingent liabilities
Additional paid-in-capital	$ 139,968	$ 141,248
Treasury stock at cost; 149,498 and 0 shares as of December 31, 2015 and 2014, respectively	(3,408)
Accumulated other comprehensive loss	(17,544)	$ (13,101)
Retained earnings	82,950	40,865
Total stockholders' equity	202,160	169,204
Total liabilities and stockholders' equity	$ 647,423	$ 539,304