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Consolidated Statements of Partners' Capital - USD ($)
shares in Thousands, $ in Thousands
Total
General Partner [Member]
Common Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Partners Capital Excluding Noncontrolling Interest [Member]
Non-Controlling Interest [Member]
Balance, beginning of period at Dec. 31, 2012 $ 617,447 $ 10,026 $ 605,019 $ (443) $ 614,602 $ 2,845
Balance, beginning of period (in shares) at Dec. 31, 2012     10,603      
Issuance of common units 75,000   $ 75,000   75,000  
Issuance of common units (in shares)     378      
Capital contribution 1,531 1,531     1,531  
Cost associated with equity transactions (293)   $ (293)   (293)  
Distributions to unitholders (246,518) (4,930) (241,588)   (246,518)  
Distributions to non-controlling interests (2,521)         (2,521)
Net income (loss) 172,078 3,442 168,636   172,078  
Comprehensive income from unconsolidated investment and other 65     65 65  
Balance, end of period at Dec. 31, 2013 616,789 10,069 $ 606,774 (378) 616,465 324
Balance, end of period (in shares) at Dec. 31, 2013     10,981      
Issuance of common units 127,202   $ 127,202   127,202  
Issuance of common units (in shares)     1,006      
Issuance of common units for acquisitions 31,604   $ 31,604   31,604  
Issuance of common units for acquisitions (in shares)     243      
Capital contribution 3,240 3,240     3,240  
Cost associated with equity transactions (4,413)   $ (4,413)   (4,413)  
Distributions to unitholders (162,042) (3,241) (158,801)   (162,042)  
Distributions to non-controlling interests (974)         (974)
Net income (loss) 108,830 2,177 106,653   108,830  
Comprehensive income from unconsolidated investment and other (81)     (81) (81)  
Balance, end of period at Dec. 31, 2014 720,155 12,245 $ 709,019 (459) 720,805 (650)
Balance, end of period (in shares) at Dec. 31, 2014     12,230      
Cost associated with equity transactions (109)   $ (109)   (109)  
Distributions to unitholders (71,758) (1,434) (70,324)   (71,758)  
Distributions to non-controlling interests (2,744)         (2,744)
Net income (loss) (571,720) (12,228) (559,492)   (571,720)  
Non-cash contributions 811 811     811  
Comprehensive income from unconsolidated investment and other (1,693)     (1,693) (1,693)  
Balance, end of period at Dec. 31, 2015 $ 72,942 $ (606) $ 79,094 $ (2,152) $ 76,336 $ (3,394)
Balance, end of period (in shares) at Dec. 31, 2015     12,230