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Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Amortizable    
Gross Carrying Amount $ 1,167,355 $ 1,176,240
Accumulated Amortization 248,497 220,517
Non-Amortizable    
Total non-amortizable 332,620 332,620
Gross carrying amount of intangible assets 1,499,975 1,508,860
Trade names    
Non-Amortizable    
Total non-amortizable $ 22,620 22,620
Weighted average    
Amortizable    
Useful Lives 12 years  
Customer relationships    
Amortizable    
Gross Carrying Amount $ 912,418 921,418
Accumulated Amortization $ 179,743 159,215
Customer relationships | Minimum    
Amortizable    
Useful Lives 3 years  
Customer relationships | Maximum    
Amortizable    
Useful Lives 20 years  
Pipeline capacity rights    
Amortizable    
Gross Carrying Amount $ 119,636 119,636
Accumulated Amortization $ 3,568 2,571
Useful Lives 30 years  
Water facility development agreement    
Amortizable    
Gross Carrying Amount $ 14,000 14,000
Accumulated Amortization $ 5,600 4,900
Useful Lives 5 years  
Executory contracts and other agreements    
Amortizable    
Gross Carrying Amount $ 23,920 23,920
Accumulated Amortization $ 19,063 18,387
Executory contracts and other agreements | Minimum    
Amortizable    
Useful Lives 2 years  
Executory contracts and other agreements | Maximum    
Amortizable    
Useful Lives 10 years  
Non-compete agreements    
Amortizable    
Gross Carrying Amount $ 26,771 26,662
Accumulated Amortization $ 11,629 10,408
Non-compete agreements | Minimum    
Amortizable    
Useful Lives 2 years  
Non-compete agreements | Maximum    
Amortizable    
Useful Lives 10 years  
Customer commitments    
Non-Amortizable    
Total non-amortizable $ 310,000 310,000
Trade names    
Amortizable    
Gross Carrying Amount 15,439 15,439
Accumulated Amortization $ 9,184 7,569
Trade names | Minimum    
Amortizable    
Useful Lives 2 years  
Trade names | Maximum    
Amortizable    
Useful Lives 12 years  
Debt issuance costs    
Amortizable    
Gross Carrying Amount $ 55,171 55,165
Accumulated Amortization $ 19,710 $ 17,467
Debt issuance costs | Minimum    
Amortizable    
Useful Lives 5 years  
Debt issuance costs | Maximum    
Amortizable    
Useful Lives 10 years