v3.3.1.900

Tax Treatment of Distributions (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per common share |  | $ 1.40 | $ 1.40 |  | $ 1.40
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per common share | $ 1.400 | 1.400 | 1.400 |  |
Less: Dividends declared in the current year and paid in the following year | (0.350) | (0.350) | (0.350) |  |
Add: Dividends declared in the prior year and paid in the current year | 0.350 | 0.350 | 0.350 |  |
Dividends paid per common share | $ 1.400 | $ 1.400 | $ 1.400 | $ 1.400 |

X
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