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Stockholders' Equity (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 22, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Preferred stock |  | $ 92,000,000 | $ 92,000,000
Common stock |  | 59,885,000 | 59,885,000
Legal surplus |  | 92,600,000 | 90,200,000
Stock Repurchase Program Remaining Authorized Repurchase Amount |  | $ 7,700,000 |
Stock repurchase program remaining number of shares authorized to be repurchased |  | 390,644 |
Stock Repurchase Program Authorized Amount |  | $ 70,000,000 |
Share price |  | $ 19.79 |
Preferred Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Preferred Stock Issue Costs |  | $ 10,100,000 | 10,100,000
Common Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Common Stock Issuance Cost |  | 13,600,000 | 13,600,000
Series C Convertible Preferred Stock |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Conversion of convertable securities, conversion rate ratio | 8642.25% |  |
Preferred stock, shares issued | 84,000 |  |
Preferred stock |  | 92,000,000 | 92,000,000
Common stock |  | $ 59,900,000 | $ 59,900,000

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