Equity Investments (Tables)

12 Months Ended

Dec. 31, 2012

Equity Investments [Abstract]

Schedule of Financial Information Related to Unconsolidated Entities-Balance Sheet

	December 31,
	2012		2011
Current assets	$	240,086	$	233,496
Noncurrent assets		847,484		790,125
Total assets	$	1,087,570	$	1,023,621
Current liabilities	$	89,933	$	82,687
Noncurrent liabilities		1,941		2,094
Members' equity		995,569		938,672
Noncontrolling interest		127		168
Total liabilities and equity	$	1,087,570	$	1,023,621

Schedule of Financial Information Related to Unconsolidated Entities-Income Statement

	Year Ended December 31,
	2012		2011		2010
Revenues	$	1,236,915	$	1,230,146	$	1,195,108
Operating costs and expenses	$	1,079,055	$	1,068,212	$	1,044,751
Income from continuing operations before taxes	$	157,762	$	162,124	$	150,640