Reporting Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment information                      
Revenue, net                 $ 307,309 $ 294,051 $ 204,868
Derivative, Gain (Loss) on Derivative, Net                 1,091 28 3,400
Total revenue 80,177 70,305 77,680 80,238 76,770 77,519 77,191 62,599 308,400 294,079 208,268
Direct operating expenses                 (45,702) (32,236) (17,183)
Purchases of natural gas, NGLs and condensate                 197,952 215,053 154,472
Selling, general and administrative expenses                 (23,103) (19,079) (14,309)
Advisory services agreement termination fee                     (6,252)
Allocated Share-based Compensation Expense                 (1,536) (2,094) (1,783)
Depreciation and Accretion Expense, Including Discontinued Operation                 28,832 29,999 21,414
Depreciation, Depletion and Amortization                 (28,832) (30,002) (21,287)
Gross Profit 36,227 21,332 22,167 23,081 22,891 20,908 18,317 12,705 102,807 74,821 209,034
Costs and Expenses                 297,125 298,464  
Gain (loss) on acquisition of assets                     49,431
Gain (loss) on involuntary conversion of property, plant and equipment               400 0 343 (1,021)
Loss on impairment of property, plant and equipment                 (122) 0 123
Other expense                 (670) 0 0
Loss on impairment of property, plant and equipment 99,900       3,000   15,200 100 99,892 18,155 0
Interest expense                 7,577 9,291 4,570
Earnings in unconsolidated affiliates                 348 0 0
Income Tax Expense (Benefit), Continuing Operations                 557 (495) 0
Net income (loss)                 (97,806) (33,406) (6,252)
Gain (loss) from operations of disposal groups, net of tax (29) (26) (506) (50) (523) (15) (1,869) (6) (611) (2,413) (18)
Less: Comprehensive income (loss) attributable to noncontrolling interests                 214 633 256
Net income (loss) (94,297) (2,456) (1,667) 400 (5,641) (2,731) (22,114) (3,553) (98,020) (34,039) (6,508)
Gathering And Processing [Member]                      
Segment information                      
Revenue, net                 203,616 205,179 152,339
Derivative, Gain (Loss) on Derivative, Net                 1,091 28 3,400
Total revenue                 204,707 205,207 155,739
Direct operating expenses                 (23,783) (14,574) (12,152)
Purchases of natural gas, NGLs and condensate                 152,690 168,574 117,956
Gross Profit                 50,817 36,985 36,118
Transmission [Member]                      
Segment information                      
Revenue, net                 88,189 79,041 52,529
Derivative, Gain (Loss) on Derivative, Net                 0 0 0
Total revenue                 88,189 79,041 52,529
Direct operating expenses                 (15,577) (13,259) (5,031)
Purchases of natural gas, NGLs and condensate                 45,262 46,479 36,516
Gross Profit                 42,828 32,408 13,313
Terminals [Member]                      
Segment information                      
Revenue, net                   9,831  
Derivative, Gain (Loss) on Derivative, Net                 0 0  
Total revenue           9,800     15,504    
Business Acquisition, Pro Forma Revenue                   9,831  
Direct operating expenses                 (6,342) (4,403)  
Purchases of natural gas, NGLs and condensate                 0 0  
Gross Profit                 9,162 5,428  
Commodity Contract [Member]                      
Segment information                      
Unrealized gain (loss) on commodity derivatives                 595 (1,495) 992
Gain (Loss) on Derivative Instruments [Member] | Commodity Contract [Member]                      
Segment information                      
Unrealized gain (loss) on commodity derivatives                 356 (1,041) 992
Terminals [Member] | Terminals [Member]                      
Segment information                      
Revenue, net                 $ 15,504