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Stock Based Compensation (Changes in Awards Expected to Vest) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-Based Compensation [Abstract] |  |  |
Change in estimate expense non-vested stock awards | $ (1,410) | $ (6,031) | $ (12,195)
Change in estimate expense non-vested stock awards, net of tax | $ (857) | $ (3,332) | $ (7,520)
Change in accounting estimate non vested stock awards basic earnings per share | $ 0.03 | $ 0.11 | $ 0.25
Change in accounting estimate non vested stock awards diluted earnings per share | $ 0.03 | $ 0.11 | $ 0.24

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- Definition The basic per share expense during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest. + References No definition available. + Details
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- Definition The diluted per share expense during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest. + References No definition available. + Details
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- Definition Expense recognized during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest. + References No definition available. + Details
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- Definition Expense, net of income tax, recognized during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest. + References No definition available. + Details
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- References No definition available. + Details
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