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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
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 | 744,007 | 677,605 | 628,935 | 576,975
Numerator: |  |  |  |
Net income | $ 26,585 | $ 25,281 | $ 34,473 | $ 36,512
Private perpetual preferred unit distributions | (234) | 0 | (468) | 0
Earnings allocated to unvested units | (161) | (108) | (284) | (247)
Net income attributable to common unitholders - basic and diluted | $ 26,190 | $ 25,173 | $ 33,721 | $ 36,265
Denominator: |  |  |  |
Weighted average units outstanding - basic and diluted | 265,867,000 | 244,436,000 | 265,866,000 | 244,431,000
Earnings per unit - basic and diluted | $ 0.10 | $ 0.10 | $ 0.13 | $ 0.15

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