Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment information
Net revenues	$ 645,940	$ 714,435	$ 1,939,166	$ 2,274,052
Income (loss) from operations	22,831	93,280	64,264	273,476
Depreciation and amortization	40,253	79,968	134,802	237,654
Income (loss) from unconsolidated affiliates	2,291	2,296	6,247	7,838
Impairment losses			4,560	71,846
Capital expenditures	80,953	42,456	161,267	159,073
Total assets	2,463,099		2,463,099		2,183,991
Investment in and advances to unconsolidated affiliates	183,067		183,067		193,331
Goodwill and other intangible assets, net	966,144		966,144		852,046
East Midwest [Member]
Segment information
Net revenues	371,505	403,900	1,082,310	1,293,391
Income (loss) from operations	17,842	85,162	44,447	288,808
Depreciation and amortization	24,304	39,741	77,038	121,898
Impairment losses			4,560
Capital expenditures	63,979	23,185	91,077	90,127
Total assets	968,114		968,114		590,606
Investment in and advances to unconsolidated affiliates	52		52		79
Goodwill and other intangible assets, net	264,147		264,147		120,458
West [Member]
Segment information
Net revenues	58,626	57,463	178,579	181,057
Income (loss) from operations	5,054	7,402	20,536	33,708
Depreciation and amortization	2,018	3,487	5,259	10,115
Capital expenditures	8,091	3,396	24,138	6,313
Total assets	271,898		271,898		212,098
Goodwill and other intangible assets, net	146,474		146,474		146,012
Southern Plains [Member]
Segment information
Net revenues	210,309	246,443	658,792	773,548
Income (loss) from operations	24,195	35,176	63,392	56,595
Depreciation and amortization	12,264	32,697	47,088	93,411
Income (loss) from unconsolidated affiliates	2,546	2,599	7,619	8,383
Impairment losses				71,846
Capital expenditures	7,124	15,976	40,457	58,205
Total assets	908,674		908,674		945,472
Investment in and advances to unconsolidated affiliates	117,868		117,868		127,749
Goodwill and other intangible assets, net	551,446		551,446		566,016
Other [Member]
Segment information
Net revenues	5,500	6,629	19,485	26,056
Income (loss) from operations	(24,260)	(34,460)	(64,111)	(105,635)
Depreciation and amortization	1,667	4,043	5,417	12,230
Income (loss) from unconsolidated affiliates	(255)	(303)	(1,372)	(545)
Capital expenditures	1,759	(101)	5,595	4,428
Total assets	314,413		314,413		435,815
Investment in and advances to unconsolidated affiliates	65,147		65,147		65,503
Goodwill and other intangible assets, net	$ 4,077		$ 4,077		$ 19,560