v3.4.0.3

Equity compensation plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
Equity compensation plans |
Schedule of changes in outstanding LTIP notional units |
|  |  |  | Grant Date |
|  |  |  | Weighted-Average |
|  | Units |  | Fair Value per Unit |
Outstanding at December 31, 2015 |  | 1,298,401 |  | $ | 2.88 |
Granted |  | 1,594,954 |  |  | 1.81 |
Vested and redeemed |  | (697,742) |  |  | 2.92 |
Forfeitures |  | (7,431) |  |  | 2.71 |
Outstanding at March 31, 2016 |  | 2,188,182 |  | $ | 2.08 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration