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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2020 USD ($) | Feb. 28, 2020 $ / shares shares | Apr. 15, 2013 $ / shares shares | Mar. 31, 2020 director quarter $ / shares | Mar. 31, 2021 USD ($) quarter director $ / shares shares | Mar. 31, 2020 USD ($) $ / shares | Dec. 31, 2020 $ / shares shares
Stockholders' Equity |  |  |  |  |  |  |
Proceeds from issuance of redeemable preferred stock | $ |  |  |  |  | $ 0 | $ 275,000 |
Series B Preferred Stock |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock, dividend rate |  |  |  |  | 7.50% |  | 7.50%
Preferred stock, shares issued (in shares) | shares |  |  |  |  | 8,000,000 |  | 8,000,000
Preferred stock par value (usd per share) |  |  |  |  | $ 0.01 |  | $ 0.01
Series C Preferred Stock |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock, dividend rate |  |  |  |  | 6.50% |  | 6.50%
Preferred stock, shares issued (in shares) | shares |  |  |  |  | 11,000,000 |  | 11,000,000
Preferred stock par value (usd per share) |  |  |  |  | $ 0.01 |  | $ 0.01
Preferred Stock | Series B Preferred Stock |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock, dividend rate |  |  | 7.50% |  | 7.50% | 7.50% |
Preferred stock, shares issued (in shares) | shares |  |  | 8,000,000.0 |  |  |  |
Preferred stock par value (usd per share) |  |  | $ 0.01 |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  | 25.00 | $ 25.00 | $ 25.00 | $ 25.00 |
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  |  | 6 |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  |  |  | 2 |  |
Percentage required for making material changes |  |  | 66.67% |  |  |  |
Preferred Stock | Series C Preferred Stock |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock, dividend rate |  | 6.50% |  |  | 6.50% | 6.50% |
Preferred stock, shares issued (in shares) | shares |  | 11,000,000.0 |  |  |  |  |
Preferred stock par value (usd per share) |  | $ 0.01 |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | 25.00 |  | $ 25.00 | $ 25.00 | $ 25.00 |
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  | 6 |  |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  |  | 2 |  |  |
Shares reclassified to redeemable capital stock (in shares) | shares |  | 12,650,000 |  |  |  |  |
Proceeds from issuance of redeemable preferred stock | $ | $ 266,000 |  |  |  |  |  |
LIBOR | Preferred Stock | Series C Preferred Stock |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 5.345% |  |  |  |  |

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