Earnings Per Share (Narrative) (Details) - shares shares in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Schedule of Earnings per Share [Line Items] | ||
| Weighted average number shares outstanding – basic (in shares) | 304,158 | 304,569 |
| OP Units | ||
| Schedule of Earnings per Share [Line Items] | ||
| Weighted average number shares outstanding – basic (in shares) | 300 | |