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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 10, 2009 USD ($) $ / shares shares | Dec. 31, 2015 shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Preferred Stock [Abstract] |  |  |  |
Preferred stock, shares authorized | shares |  | 20,000,000 |  |
Common stock |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Initial public offering, effective date | Aug. 10, 2009 |  |  |
Initial public offering, shares issued | shares | 5,000,000 |  |  |
Initial public offering, price per share | $ / shares | $ 17.00 |  |  |
Initial public offering, gross proceeds | $ | $ 85.0 |  |  |
Initial public offering, underwriting discounts | $ | 6.0 |  |  |
Initial public offering, issuance costs | $ | 4.2 |  |  |
Initial public offering, net proceeds | $ | $ 74.8 |  |  |
Initial public offering, number of shares common stock received in exchange for preferred stock | 2 |  |  |
Common stock |  |  |  |
Common Stock [Abstract] |  |  |  |
Share-based compensation, shares | shares |  | 86,102 | 15,300 | 19,743
Exercise of options and related tax benefit, shares | shares |  | 3,409 |  | 36,758

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