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Capital - Earnings Per Unit (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0   0  
Numerator:        
Net income - basic and diluted $ 25,281 $ 3,071 $ 36,512 $ 5,001
Denominator:        
Weighted average units outstanding - basic (in units) 245,899,000   245,839,000  
Effective of dilutive securities - share-based compensation (in units) 42,000   42,000  
Weighted average units outstanding - dilutive (in units) 245,941,000   245,881,000  
Earnings Per Share, Basic $ 0.10   $ 0.15  
Earnings Per Share, Diluted $ 0.10   $ 0.15