Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 420,396	$ 403,571
Short-term investments	205,294
Customer receivables, less allowances of $10,286 and $8,866, respectively	453,346	397,579
Other receivables	9,578	10,586
Prepaid expenses and other current assets	49,882	55,098
Total current assets	1,138,496	866,834
Property and equipment:
Revenue equipment	1,892,005	1,898,999
Land and structures	2,167,557	2,039,937
Other fixed assets	495,268	482,425
Leasehold improvements	12,043	11,709
Total property and equipment	4,566,873	4,433,070
Accumulated depreciation	(1,631,398)	(1,464,235)
Net property and equipment	2,935,475	2,968,835
Goodwill	19,463	19,463
Other assets	180,254	140,436
Total assets	4,273,688	3,995,568
Current liabilities:
Accounts payable	59,229	70,254
Compensation and benefits	217,154	192,524
Claims and insurance accruals	54,493	54,330
Other accrued liabilities	60,141	46,130
Income taxes payable	13,271	2,847
Current maturities of long-term debt	45,000
Total current liabilities	449,288	366,085
Long-term liabilities:
Long-term debt	99,927	45,000
Other non-current liabilities	316,831	241,802
Deferred income taxes	236,809	261,964
Total long-term liabilities	653,567	548,766
Total liabilities	1,102,855	914,851
Commitments and contingent liabilities
Shareholders’ equity:
Common stock - $0.10 par value, 280,000,000 shares authorized, 117,331,447 shares outstanding at September 30, 2020 and 140,000,000 shares authorized, 119,532,534 shares outstanding at December 31, 2019	11,733	11,953
Capital in excess of par value	185,991	218,462
Retained earnings	2,973,109	2,850,302
Total shareholders’ equity	3,170,833	3,080,717
Total liabilities and shareholders’ equity	$ 4,273,688	$ 3,995,568