Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
OPERATING REVENUES	$ 222,745	$ 217,210	$ 647,600	$ 618,710
OPERATING EXPENSES:
Labor and benefits	64,022	58,986	191,145	176,034
Equipment rents	9,289	11,357	28,073	32,887
Purchased services	20,962	20,316	58,297	57,463
Depreciation and amortization	18,980	16,623	54,947	48,781
Diesel fuel used in operations	21,511	21,441	64,643	65,516
Diesel fuel sold to third parties	1,359	3,662	10,460	12,241
Casualties and insurance	6,237	5,020	17,727	16,686
Materials	6,241	6,844	19,131	19,517
Net gain on sale of assets	3,018	610	10,447	2,708
Gain on insurance recoveries	0	0	(5,186)	(1,043)
Other operating expenses	24,287	17,548	62,148	46,945
Total operating expenses	169,870	161,187	490,938	472,319
INCOME FROM OPERATIONS	52,875	56,023	156,662	146,391
Interest income	928	853	2,759	2,486
Interest expense	(8,814)	(10,573)	(26,052)	(30,765)
Gain on sale of investments	0	0	0	894
Contingent forward sale contract mark-to-market expense	(50,106)	0	(50,106)	0
Other income/(expense), net	853	(1,064)	1,852	(595)
(Loss)/income from continuing operations before income taxes	(4,264)	45,239	85,115	118,411
Provision for income taxes	15,303	12,287	46,051	32,192
(Loss)/Income from continuing operations, net of tax	(19,567)	32,952	39,064	86,219
Loss from discontinued operations, net of tax	0	(10)	(27)	(10)
NET (LOSS)/INCOME	$ (19,567)	$ 32,942	$ 39,037	$ 86,209
BASIC (LOSS)/EARNINGS PER SHARE:
Basic (loss)/earnings per common share from continuing operations	$ (0.47)	$ 0.82	$ 0.96	$ 2.16
Basic loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Basic (loss)/earnings per common share	$ (0.47)	$ 0.82	$ 0.95	$ 2.16
Weighted average shares - basic	41,682	40,078	40,888	39,825
DILUTED (LOSS)/EARNINGS PER SHARE:
Diluted (loss)/earnings per common share from continuing operations	$ (0.47)	$ 0.77	$ 0.90	$ 2.02
Diluted loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted (loss)/earnings per common share	$ (0.47)	$ 0.77	$ 0.90	$ 2.02
Weighted average shares - diluted	41,682	42,821	43,471	42,711