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Stock Based Compensation (Changes in Awards Expected to Vest) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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.

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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.

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