Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 280,627	$ 190,282
Customer receivables, less allowances of $10,215 and $9,913, respectively	447,242	427,569
Other receivables	8,091	40,691
Prepaid expenses and other current assets	47,918	47,687
Total current assets	783,878	706,229
Property and equipment:
Revenue equipment	1,835,518	1,811,233
Land and structures	1,829,360	1,796,868
Other fixed assets	463,326	454,432
Leasehold improvements	10,873	10,619
Total property and equipment	4,139,077	4,073,152
Accumulated depreciation	(1,377,220)	(1,318,209)
Net property and equipment	2,761,857	2,754,943
Goodwill	19,463	19,463
Other assets	138,844	64,648
Total assets	3,704,042	3,545,283
Current liabilities:
Accounts payable	79,397	78,518
Compensation and benefits	174,346	198,456
Claims and insurance accruals	50,570	53,263
Other accrued liabilities	53,842	26,495
Total current liabilities	358,155	356,732
Long-term liabilities:
Long-term debt	45,000	45,000
Other non-current liabilities	282,847	215,399
Deferred income taxes	247,669	247,669
Total long-term liabilities	575,516	508,068
Total liabilities	933,671	864,800
Commitments and contingent liabilities
Shareholders’ equity:
Common stock - $0.10 par value, 140,000,000 shares authorized, 81,071,908 and 81,231,131 shares outstanding at March 31, 2019 and December 31, 2018, respectively	8,107	8,123
Capital in excess of par value	143,123	142,176
Retained earnings	2,619,141	2,530,184
Total shareholders’ equity	2,770,371	2,680,483
Total liabilities and shareholders’ equity	$ 3,704,042	$ 3,545,283