Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012	Dec. 31, 2012
Segment Information
Number of reportable segments			3
Segment information
Net revenues	$ 714,435	$ 707,044	$ 2,274,052	$ 2,155,654
Income (loss) from operations	93,280	98,666	273,476	369,296
Depreciation and amortization	79,968	62,399	237,654	172,527
Gain (loss) from unconsolidated affiliates	2,296	807	7,838	3,546
Impairment losses			71,846
Capital expenditures	42,456	110,774	159,073	364,952
Total assets	5,396,738		5,396,738		5,644,057
Investment in and advances to unconsolidated affiliates	195,825		195,825		204,506
Goodwill and other intangible assets, net	2,002,011		2,002,011		2,087,166
Midwest
Segment information
Net revenues	244,011	247,287	789,502	670,373
Income (loss) from operations	48,349	55,088	165,214	148,509
Depreciation and amortization	32,352	24,791	97,182	61,989
Capital expenditures	22,404	94,562	83,650	305,521
Total assets	2,268,140		2,268,140		2,318,283
Goodwill and other intangible assets, net	1,023,108		1,023,108		1,025,505
East/West
Segment information
Net revenues	294,816	324,603	928,934	1,043,884
Income (loss) from operations	59,416	68,078	204,478	228,700
Depreciation and amortization	18,813	22,430	58,938	66,455
Capital expenditures	6,448	8,376	20,508	34,917
Total assets	1,158,411		1,158,411		1,198,391
Investment in and advances to unconsolidated affiliates	79		79		87
Goodwill and other intangible assets, net	226,047		226,047		226,047
Southern Plains
Segment information
Net revenues	168,979	128,604	529,560	415,729
Income (loss) from operations	19,975	26,496	9,419	108,739
Depreciation and amortization	24,760	11,028	69,304	33,627
Gain (loss) from unconsolidated affiliates	2,599	1,036	8,383	3,991
Impairment losses			71,846
Capital expenditures	13,705	6,770	50,487	19,583
Total assets	1,578,476		1,578,476		1,680,773
Investment in and advances to unconsolidated affiliates	129,897		129,897		138,514
Goodwill and other intangible assets, net	697,057		697,057		779,787
Other
Segment information
Net revenues	6,629	6,550	26,056	25,668
Income (loss) from operations	(34,460)	(50,996)	(105,635)	(116,652)
Depreciation and amortization	4,043	4,150	12,230	10,456
Gain (loss) from unconsolidated affiliates	(303)	(229)	(545)	(445)
Capital expenditures	(101)	1,066	4,428	4,931
Total assets	391,711		391,711		446,610
Investment in and advances to unconsolidated affiliates	65,849		65,849		65,905
Goodwill and other intangible assets, net	$ 55,799		$ 55,799		$ 55,827