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Stockholders' Equity Stockholders' Equity (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Issued | 104,574 | 104,574 |
Preferred Stock, Par Value Per Share | $ 1.00 | $ 1.00 | $ 1.00
Preferred Stock, Liquidation Preference Per Share | $ 1,000 | $ 1,000 |
Operating Loss Carryforwards |  |  | $ 725,800,000
Common Stock Ownership Enabling Preferred Stock Purchase Rights | 4.99% | 4.99% |
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental | 0.50% | 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 | $ 1.00 |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 | $ 1,000 |
Preferred stock | $ 4,600,000 | $ 4,600,000 | $ 0
Preferred Stock, Dividend Rate, Percentage |  | 7.50% |
Preferred stock dividend condition - minimum pension funding | 90.00% | 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 | 150,000,000 |
Preferred Stock, Liquidation Preference, Value | 109,600,000 | 109,600,000 |
Preferred Stock, Cumulative Undeclared Dividend | $ 5,000,000 | $ 5,000,000 |
Restricted Stock Units (RSUs) [Member] |  |  |
Class of Stock [Line Items] |  |  |
Share-based Compensation, Non-Option Equity Instruments, Granted | 5,000 | 30,000 |

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