Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Compensation cost under share and unit-based plans | $ 4,616 | $ 6,490 | $ 28,219 | $ 30,437 |
LTIP Units | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Compensation cost under share and unit-based plans | 3,440 | 5,269 | 21,823 | 24,892 |
Stock units | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Compensation cost under share and unit-based plans | 972 | 1,002 | 5,717 | 4,947 |
Stock options | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Compensation cost under share and unit-based plans | 32 | 34 | 94 | 53 |
Phantom stock units | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Compensation cost under share and unit-based plans | $ 172 | $ 185 | $ 585 | $ 545 |