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Stockholders' Equity and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |
Income attributable to noncontrolling interests | $ 2,484 | $ 2,617 | $ 8,530 | $ 7,628
Depositary shares outstanding (in shares) | 7.2 |  | 7.2 |
6.875 Series C Cumulative Redeemable Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00% |
Percentage of redeemable preferred stock |  |  | 6.875% |
Cumulative redeemable preferred stock liquidation preference (in usd per share) | $ 25.00 |  | $ 25.00 |
Annual dividend on depositary shares (in usd per share) |  |  | $ 1.71875 |
Series C Cumulative Redeemable Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percentage of redeemable preferred stock |  |  | 6.875% |

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