Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 7,133	$ 11,472
Customer receivables, less allowances of $8,925 and $8,976, respectively	311,650	310,501
Other receivables	4,554	34,547
Prepaid expenses and other current assets	32,287	25,210
Total current assets	355,624	381,730
Property and equipment:
Revenue equipment	1,409,501	1,358,317
Land and structures	1,266,327	1,221,250
Other fixed assets	375,260	365,673
Leasehold improvements	8,686	7,585
Total property and equipment	3,059,774	2,952,825
Accumulated depreciation	(961,616)	(929,377)
Net property and equipment	2,098,158	2,023,448
Goodwill	19,463	19,463
Other assets	42,195	41,863
Total assets	2,515,440	2,466,504
Current liabilities:
Accounts payable	81,079	66,774
Compensation and benefits	118,226	124,589
Claims and insurance accruals	44,497	44,917
Other accrued liabilities	24,944	22,634
Income taxes payable	28,881	0
Current maturities of long-term debt	25,596	26,488
Total current liabilities	323,223	285,402
Long-term liabilities:
Long-term debt	99,726	107,317
Other non-current liabilities	157,161	154,094
Deferred income taxes	235,054	235,054
Total long-term liabilities	491,941	496,465
Total liabilities	$ 815,164	$ 781,867
Commitments and Contingencies
Shareholders' equity:
Common stock - $0.10 par value, 140,000,000 shares authorized, 83,649,398 and 84,411,878 shares outstanding at March 31, 2016 and December 31, 2015, respectively	$ 8,365	$ 8,441
Capital in excess of par value	134,401	134,401
Retained earnings	1,557,510	1,541,795
Total shareholders' equity	1,700,276	1,684,637
Total liabilities and shareholders' equity	$ 2,515,440	$ 2,466,504