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Stockholders' Equity Stockholders' Equity (Narrative) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |
Preferred Stock, Shares Issued | 104,574 |
Preferred Stock, Par Value Per Share | $ 1.00 | $ 1.00
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |
Operating Loss Carryforwards |  | $ 789,700,000
Common Stock Ownership Enabling Preferred Stock Purchase Rights | 4.99% |
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental | 0.50% |
Preferred Series B [Member] |  |
Class of Stock [Line Items] |  |
Preferred Stock, Shares Issued | 104,574 | 104,574
Preferred Stock, Par Value Per Share | $ 1.00 |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |
Preferred stock | $ 4,600,000 | $ 4,600,000
Preferred Stock, Dividend Rate, Percentage | 7.50% | 7.50%
Preferred stock dividend condition - minimum pension funding | 90.00% |
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 | 117,400,000 | $ 111,500,000
Preferred Stock, Cumulative Undeclared Dividend | $ 12,800,000 | $ 6,900,000

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