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Redeemable Preferred Stock (FY) (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 1998 shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2006 USD ($) | Jun. 30, 2020 USD ($) Tranche $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 1991 $ / shares shares | Dec. 31, 1990 Tranche shares | Apr. 18, 2017 USD ($)
Preferred stock [Abstract] |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate per annum |  |  |  |  |  |  | 12.00% |  |  |
Senior Redeemable Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Redemption amount of senior redeemable preferred stock | $ |  |  |  |  |  |  |  |  |  | $ 2,100,000
Public Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred stock [Abstract] |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (in shares) |  | 6,000,000 |  | 6,000,000 | 6,000,000 |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |  |  |  |
Preferred stock dividend rate per annum |  |  |  | 12.00% | 12.00% |  |  | 6.00% |  |
Dividends Payable | $ |  | $ 109,300,000 |  | $ 109,300,000 | $ 107,400,000 | $ 103,500,000 |  |  |  |
Public preferred stock, shares retired | 410,000 |  |  |  |  |  |  |  |  |
Preferred stock issued and outstanding (in shares) |  | 3,185,586 |  | 3,185,586 | 3,185,586 |  |  |  | 2,858,723 |
12% Cumulative Exchangeable Redeemable Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Adjusted accrued accretion of public preferred stock | $ |  |  | $ 1,500,000 |  |  |  |  |  |  |
Number of shares declared as dividend (in shares) |  |  |  |  |  |  |  | 736,863 |  |
Number of annual tranches during the period | Tranche |  |  |  | 5 |  |  |  |  | 5 |
Period during which redeemable preferred stock not callable |  |  |  | 12 months | 12 months |  |  |  |  |
Preferred stock dividend rate per annum (in dollars per share) | $ / shares |  |  |  | $ 1.20 | $ 1.20 |  |  | $ 0.60 |  |
Preferred stock, liquidation preference (in dollars per share) | $ / shares |  | $ 10 |  | $ 10 | $ 10 |  |  |  |  |
Dividends on preferred stock | $ |  | $ 1,000,000 |  | $ 1,900,000 | $ 3,800,000 |  |  |  |  |
Series A-1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred stock [Abstract] |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (in shares) |  |  |  |  |  |  | 1,250 |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |
Preferred stock dividend rate per annum |  |  |  |  |  | 14.125% |  |  |  |
Senior Redeemable Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Redeemable preferred stock liquidation value (in dollar per share) | $ / shares |  |  |  |  |  | $ 1,000 |  |  |  |
Series A-2 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred stock [Abstract] |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (in shares) |  |  |  |  |  |  | 1,750 |  |  |
Senior Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Senior Redeemable Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Accrued dividends reported as interest expenses | $ |  |  |  |  | $ 0 | $ 0 | $ 20,000 |  |  |

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