Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information [Abstract]

Quarterly Financial Information

	March 31	June 30	September 30	December 31
		(a)(b)	(a)(b)	(a)
	(In thousands, except per share data)
2011:
Revenues	$  872,938	$  985,528	$ 1,198,673	$  1,228,756
Gross profit	129,773	171,440	118,974	153,280
Income from operations	102,238	95,354	76,256	139,728
Net income	55,874	6,630	9,121	71,215
Basic earnings per common share	0.34	0.04	0.04	0.34
Diluted earnings per common share	0.34	0.04	0.04	0.33

	March 31	June 30	September 30	December 31
		(c)	(d)
	(In thousands, except per share data)
2010:
Revenues	$  711,874	$  764,295	$  874,705	$  835,394
Gross profit	61,852	100,461	119,957	107,514
Income from operations	32,200	106,499	98,347	86,938
Net income (loss)	(1,770)	66,274	46,859	48,031
Basic earnings (loss) per common share	(0.01)	0.41	0.29	0.29
Diluted earnings (loss) per common share	(0.01)	0.41	0.29	0.29