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Share-Based Compensation (Summary of Grant Date Fair Value of Awards) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Options | $ 53 | $ 633 | $ 12,580 | $ 3,507
Restricted stock | 1,247 | 1,582 | 3,361 | 4,182
Total | $ 1,300 | $ 2,215 | $ 15,941 | $ 7,689

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