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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventories    
NGLs $ 21,131 $ 11,502
Line fill 7,960 3,261
Spare parts, materials and supplies 12,272 9,870
Total inventories $ 41,363 $ 24,633