Equity Method Investees (Tables)

12 Months Ended

Dec. 31, 2011

Equity Method Investees [Abstract]

Equity method investment statement of operation and financial position

	Year Ended December 31,
	2011		2010		2009
Revenues	$	5,970,595	$	4,531,588	$	4,748,082
Gross margin		1,802,301		1,749,504		1,794,563
Net income		255,145		198,793		138,504
Equity in net income of affiliates		25,451		20,569		13,808

	December 31,
	2011		2010
Current assets	$	1,159,066	$	933,160
Noncurrent assets		7,228,052		6,135,749
Total assets	$	8,387,118	$	7,068,909
Current liabilities	$	916,344	$	830,616
Noncurrent liabilities		6,330,666		5,233,973
Equity		1,140,108		1,004,320
Total liabilities and equity	$	8,387,118	$	7,068,909