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Share-Based Compensation (Summary of Grant Date Fair Value of Awards) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options	$ 12,527	$ 2,874
Restricted stock	2,114	2,600
Total	$ 14,641	$ 5,474

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- Definition

Fair value of options awarded during the period.

+ References

No definition available.

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- Definition

Fair value of restricted stock awarded during period.

+ References

No definition available.

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- Definition

Total fair value of options and restricted stock awarded during period.

+ References

No definition available.

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