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Common Stock (Reconciliation of Common Shares Issued and Additional Disclosures) (Details) |  | 12 Months Ended
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Nov. 09, 2009 series $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Common stock, shares authorized (in shares) | 80,000,000 | 80,000,000 | 80,000,000
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001 | $ 0.0001
Preferred stock. shares authorized (in shares) | 100,000 | 100,000 | 100,000
Preferred stock, minimum number of series authorized | series | 1 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001 | $ 0.0001
Increase (Decrease) in Stockholders' Equity |  |  |
Shares issued at the beginning of the year (in shares) |  | 60,622,986 | 59,684,669
Issued as restricted stock award grants (in shares) |  | 1,539,889 | 275,029
Issued upon exercise of stock options (in shares) |  | 0 | 663,288
Shares issued at the end of the year (in shares) |  | 62,162,875 | 60,622,986

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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