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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment information          
Net revenues $ 700,956 $ 652,146 $ 1,365,094 $ 1,293,226  
Income (loss) from operations 34,694 23,382 58,172 41,433  
Depreciation and amortization 41,752 47,183 84,674 94,549  
Income (loss) from unconsolidated affiliates 4,154 1,473 8,136 3,956  
Impairment losses   4,560   4,560  
Capital expenditures 71,700 43,273 120,489 80,314  
Total assets 2,325,048   2,325,048   $ 2,211,279
Investment in and advances to unconsolidated affiliates 173,726   173,726   179,551
Goodwill and other intangible assets, net 645,584   645,584   648,144
East/Midwest          
Segment information          
Net revenues 417,756 361,357 804,300 710,805  
Income (loss) from operations 27,853 17,003 46,947 26,605  
Depreciation and amortization 27,342 25,911 55,614 52,734  
Impairment losses   4,560   4,560  
Capital expenditures 60,150 16,988 98,724 27,098  
Total assets 1,090,333   1,090,333   990,031
Investment in and advances to unconsolidated affiliates 91   91   94
Goodwill and other intangible assets, net 264,261   264,261   264,147
West          
Segment information          
Net revenues 63,664 59,033 126,250 119,953  
Income (loss) from operations 7,410 7,426 13,919 15,482  
Depreciation and amortization 2,297 1,692 4,685 3,241  
Capital expenditures 2,363 9,617 5,214 16,047  
Total assets 332,962   332,962   289,026
Goodwill and other intangible assets, net 145,198   145,198   145,054
Southern Plains          
Segment information          
Net revenues 213,689 224,726 423,958 448,483  
Income (loss) from operations 26,333 17,970 50,907 39,197  
Depreciation and amortization 10,697 17,573 21,480 34,824  
Income (loss) from unconsolidated affiliates 4,401 2,621 8,189 5,074  
Capital expenditures 8,003 13,990 14,451 33,333  
Total assets 565,278   565,278   592,405
Investment in and advances to unconsolidated affiliates 109,658   109,658   115,469
Goodwill and other intangible assets, net 232,047   232,047   234,865
Other          
Segment information          
Net revenues 5,847 7,030 10,586 13,985  
Income (loss) from operations (26,902) (19,017) (53,601) (39,851)  
Depreciation and amortization 1,416 2,007 2,895 3,750  
Income (loss) from unconsolidated affiliates (247) (1,148) (53) (1,118)  
Capital expenditures 1,184 $ 2,678 2,100 $ 3,836  
Total assets 336,475   336,475   339,817
Investment in and advances to unconsolidated affiliates 63,977   63,977   63,988
Goodwill and other intangible assets, net $ 4,078   $ 4,078   $ 4,078