Stockholders' Equity (Tax Status of Distributions) (Details) - Common Stock - $ / shares |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Class of Stock [Line Items] | |||
Tax Status of Common Stock Dividends Per Share Declared (in usd per share) | $ 0.240000 | $ 2.853075 | $ 0.320000 |
Unrecaptured Section 1250 Gain (in usd per share) | 0.070522 | 0.100934 | 0.097271 |
Nondividend Distributions (in usd per share) | 0.000000 | 2.190636 | 0.000000 |
AMT Adjustment (in usd per share) | 0.017756 | 0.000000 | 0.000000 |
Ordinary Dividends | |||
Class of Stock [Line Items] | |||
Tax Status of Common Stock Dividends Per Share Declared (in usd per share) | 0.093312 | 0.079661 | 0.161738 |
Long-Term Capital Gain | |||
Class of Stock [Line Items] | |||
Tax Status of Common Stock Dividends Per Share Declared (in usd per share) | $ 0.146688 | $ 0.582778 | $ 0.158262 |