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Stock-Based Compensation, Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 26,609	$ 19,314	$ 8,890
Stock Options [Member]
Unrecognized Stock-Based Compensation Expense [Abstract]
Unrecognized stock-based compensation expense	$ 11,200
Unrecognized stock-based compensation expense, period for recognition	1 year 4 months 24 days
Restricted Stock Awards [Member]
Unrecognized Stock-Based Compensation Expense [Abstract]
Unrecognized stock-based compensation expense	$ 16,200
Unrecognized stock-based compensation expense, period for recognition	2 years 1 month 6 days
Service-Based Options [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 3,100	4,000	5,800
Service-Based Restricted Stock Units [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	11,200	11,300	10,500
Performance-Based Options [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	12,200	3,900	(7,100)
Performance Stock Units [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 100	$ 100	$ (300)

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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-Topic 230
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