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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Narratives) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Cash settled restricted stock units and cash settled performance units
Stock-Based Compensation
Non-vested awards at the end of the period (in shares)	376
Restricted stock shares, restricted stock units and performance units
Stock-Based Compensation
Non-vested awards at the end of the period (in shares)	2,338
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
Stock-Based Compensation
Non-vested awards at the end of the period (in shares)	2,714	1,728
Unrecognized compensation
Expected unrecognized compensation cost related to unvested awards (in dollars)	$ 21.5
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	2 years 4 months 24 days

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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