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Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 187 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 12, 2019 $ / shares | Aug. 09, 2019 $ / shares | Jun. 12, 2019 $ / shares | May 20, 2019 $ / shares | Mar. 06, 2019 $ / shares | Feb. 15, 2019 $ / shares | Apr. 15, 2013 $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 $ / shares | Sep. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 $ / shares | Sep. 30, 2019 USD ($) director quarter $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 $ / shares shares | Mar. 31, 2019 USD ($) shares | Aug. 16, 2019 USD ($) | Sep. 16, 2016 shares | Dec. 31, 2013 shares | Aug. 31, 2005 shares
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  | 8,000,000 |  |  |  | 8,000,000 |  | 8,000,000 |  |  |  |  |
Preferred Stock, dividend rate |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Common stock, cash dividends declared (in dollars per share) | $ / shares | $ 0.20 |  | $ 0.20 |  | $ 0.20 |  |  | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |  |  |  |  |  |  |
Dividends and dividend equivalents declared and unpaid | $ |  |  |  |  |  |  |  | $ 90,614,000 |  | $ 90,136,000 |  | $ 90,614,000 | $ 90,136,000 |  |  |  |  |  |
Aggregate number of shares of common stock authorized (in shares) |  |  |  |  |  |  |  | 886,950,000 |  |  |  | 886,950,000 |  | 886,950,000 |  |  |  |  |
Issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 350,000 |  |  |  |  |  |
Number of shares authorized to be repurchased under the Repurchase Program (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000.0 | 4,000,000.0
Number of remaining shares authorized to be repurchased under the Repurchase Program (in shares) |  |  |  |  |  |  |  | 6,616,355 |  |  |  | 6,616,355 |  |  |  |  |  |  |
DRSPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of shares of common stock authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000.0 |  |
Shares of common stock authorized and available for issuance (in shares) |  |  |  |  |  |  |  | 11,600,000 |  |  |  | 11,600,000 |  |  |  |  |  |  |
Common shares issued through DRSPP (in shares) |  |  |  |  |  |  |  | 87,886 |  |  |  | 240,741 |  |  | 34,296,621 |  |  |  |
Net proceeds from shares issued through DRSPP | $ |  |  |  |  |  |  |  | $ 634,000 |  |  |  | $ 1,800,000 |  |  | $ 286,000,000.0 |  |  |  |
Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share, preferred stock (in dollars per share) | $ / shares |  | $ 0.46875 |  | $ 0.46875 |  | $ 0.46875 |  | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.46875 |  |  |  |  |  |  |  |
Preferred Stock | Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  | 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, dividend rate |  |  |  |  |  |  | 7.50% |  |  |  |  | 7.50% | 7.50% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ / shares |  |  |  |  |  |  | 25.00 | $ 25.00 |  |  |  | $ 25.00 |  | $ 25 |  |  |  |  |
Preferred stock, redemption price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Minimum percentage of preferred shareholders required for approval (percent) |  |  |  |  |  |  | 66.67% |  |  |  |  |  |  |  |  |  |  |  |
At The Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-the-market, maximum potential proceeds | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |
Number of shares issued (in shares) |  |  |  |  |  |  |  | 982,350 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock | $ |  |  |  |  |  |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |
Issuance costs | $ |  |  |  |  |  |  |  | 72,000 |  |  |  |  |  |  |  |  |  |  |
Value remaining outstanding for future offerings | $ |  |  |  |  |  |  |  | $ 392,800,000 |  |  |  | $ 392,800,000 |  |  |  |  |  |  |
Weighted Average | At The Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds Per Share (USD per share) | $ / shares |  |  |  |  |  |  |  | $ 7.29 |  |  |  | $ 7.29 |  |  |  |  |  |  |

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