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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Numerator: |  |  |  |
Net income | $ 32,897 | $ 26,085 | $ 74,242 | $ 60,558
Private perpetual preferred unit distributions | (234) | (234) | (702) | (702)
Earnings allocated to unvested units | (225) | (161) | (575) | (425)
Net income attributable to common unitholders - basic and diluted | $ 32,438 | $ 25,690 | $ 72,965 | $ 59,431
Denominator: |  |  |  |
Weighted average units outstanding - basic (in units) | 278,739,000 | 265,873,000 | 270,388,000 | 265,868,000
Effect of dilutive securities - stock-based compensation plans (in units) | 1,090,000 | 0 | 378,000 | 0
Effect of dilutive securities - exchangeable senior notes (in units) | 785,000 | 0 | 262,000 | 0
Weighted average units outstanding - diluted (in units) | 280,614,000 | 265,873,000 | 271,028,000 | 265,868,000
Earnings per unit - basic and diluted (in USD per share) | $ 0.12 | $ 0.10 | $ 0.27 | $ 0.22
Antidilutive securities (in units) |  | 802,462 |  | 692,209

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