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Business Combinations (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended
Feb. 14, 2013
8.00% senior notes due 2018
Feb. 01, 2013
Basin Transload
bbl
item
Mar. 31, 2014
Basin Transload
Mar. 31, 2013
Basin Transload
Feb. 28, 2013
Basin Transload
Feb. 15, 2013
Cascade Kelly
bbl
ft
Feb. 15, 2013
Cascade Kelly
8.00% senior notes due 2018
Acquisitions              
Percentage of outstanding membership interests acquired from AE Holdings   60.00%     60.00% 100.00%  
Number of transloading facilities operated   2          
Combined rail loading capacity per day (in barrels)   160,000          
Expenditures related to certain capital expansion projects   $ 91,100,000          
Purchase price           94,200,000  
Rail transloading facility, storage capacity (in barrels)           200,000  
Preliminary allocation of the purchase price              
Deepwater marine terminal, leased dock access capacity (in feet)           1,200  
Intangible assets acquired              
Amortization period     2 years        
Amortization expense     2,700,000 2,000,000      
Estimated remaining amortization expense              
2014 (4/1/14-12/31/14)     8,266,000        
2015     2,869,000        
Total     11,135,000        
Stated interest rate (as a percent) 8.00%           8.00%
Intangibles           $ 0