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Stockholders' Equity (Narrative) (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Authorized | 20,000,000 | 20,000,000 |  |  |
Preferred Stock, Par Value Per Share | $ 1.00 | $ 1.00 |  |  |
Preferred Stock, Shares Issued | 104,574 |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |  |  |  |
Preferred stock | $ 4,600,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.50% |  |  |  |
Common Stock, Shares, Issued | 12,109,389 |  |  |  |
Conversion of Stock, Shares Converted | 398,262 | 288,620 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 374,478 |  |  |  | 1,200,000
Preferred stock dividend condition - minimum net income preceding quarter | $ 7,500,000 |  |  |  |
Preferred stock dividend condition - minimum free cash flow preceding four quarters | 35,000,000 |  |  |  |
Preferred stock dividend condition - minimum cash balance preceding quarter | 150,000,000 |  |  |  |
Preferred Stock, Liquidation Preference, Value | 53,900,000 | $ 127,200,000 |  |  |
Preferred Stock, Cumulative Undeclared Dividend | $ 12,100,000 | 22,600,000 |  |  |
Operating Loss Carryforwards |  |  |  | $ 749,200,000 |
Common Stock Ownership Enabling Preferred Stock Purchase Rights | 4.99% |  |  |  |
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental | 0.50% |  |  |  |
Stock issued during period | $ 23,100,000 |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock | $ 61,600,000 | $ 0 |  |  |
Preferred Stock, Shares Outstanding | 41,720 | 104,574 | 104,574 |  |
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock, Shares Authorized | 70,000,000 | 70,000,000 |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.10 | $ 0.10 |  |  |
Common Stock, Shares, Issued | 11,390,189 | 8,347,427 |  |  |
Stock Issued During Period, Shares, New Issues | 2,537,500 | 20,000 |  |  |
Conversion of Stock, Shares Converted | 398,262 | 288,620 |  |  |
Sale of Stock, Price Per Share | $ 10.00 |  |  |  |
Gross Proceeds from Issuance of Common Stock | $ 25,400,000 |  |  |  |
Payments of Stock Issuance Costs | $ 2,300,000 |  |  |  |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock, Shares Authorized | 30,000,000 | 30,000,000 |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.10 | $ 0.10 |  |  |
Common Stock, Shares, Issued | 719,200 | 1,117,462 |  |  |
Conversion of Stock, Shares Converted | (398,262) | (288,620) |  |  |
Preferred Series B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued | 41,720 | 104,574 |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 1,000.00 |  |  |  |
Preferred stock | $ 100,000 | $ 4,600,000 |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.50% |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ 53,900,000 | $ 127,200,000 |  |  |
Stock Repurchased and Retired During Period, Shares | 62,854 |  |  |  |
Stock Repurchase Price per Share | $ 954.59 |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock | 60,000,000 |  |  |  |
Preferred Stock, Liquidation Amount per Share | $ 1,272.78 |  |  |  |
Preferred Stock, Shares Outstanding | 41,720 |  |  |  |

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