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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Feb. 28, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 375,000,000 |  | 375,000,000 |  | 375,000,000 |
Net proceeds |  |  |  | $ 132,191 | $ 74,503 |  |
Total shares issued (in shares) |  | 156,990,141 |  | 156,990,141 |  | 153,577,028 |
Stock issuance costs |  |  |  | $ 1,740 | 1,238 |  |
Common stock Dividends |  | $ 72,850 | $ 67,660 | $ 145,583 | $ 134,440 |  |
Common stock Per share (in dollars per share) |  | $ 0.475 | $ 0.455 | $ 0.950 | $ 0.910 |  |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 0.500 |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 0 | $ 0 | $ 0 | $ 3,598 |  |
Per depository share (in dollars per share) |  | $ 0 | $ 0 | $ 0 | $ 0.312847 |  |
Dividend rate |  |  |  | 6.625% |  |  |
Series E Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 4,096 | $ 4,096 | $ 8,194 | $ 8,194 |  |
Per depository share (in dollars per share) |  | $ 0.356250 | $ 0.356250 | $ 0.712500 | $ 0.712500 |  |
Dividend rate |  |  |  | 5.70% |  | 5.70% |
Series F Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 4,485 | $ 4,485 | $ 8,970 | $ 8,970 |  |
Per depository share (in dollars per share) |  | $ 0.325000 | $ 0.325000 | $ 0.650000 | $ 0.650000 |  |
Dividend rate |  |  |  | 5.20% |  | 5.20% |
DRIP |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  |  |  |  |  |  | 10,000,000
Shares of common stock (in shares) |  |  |  | 143,997 | 34,466 |  |
Net proceeds |  |  |  | $ 5,471 | $ 1,413 |  |
2018 ATM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  | 12,000,000 |  |  |
Total shares issued (in shares) |  | 3,037,464 |  | 3,037,464 |  |  |
2016 ATM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  | 12,000,000 |  |  |
Total shares issued (in shares) |  | 10,044,656 |  | 10,044,656 |  |  |
ATM Equity Programs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of common stock (in shares) |  |  |  | 3,037,464 | 1,653,155 |  |
Average price per share (net) (in dollars per share) |  |  |  | $ 41.17 | $ 43.64 |  |
Net proceeds |  |  |  | $ 125,052 | $ 72,139 |  |
Stock issuance costs |  |  |  | $ 1,633 | $ 1,183 |  |

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