Stock-based Compensation - Stock Option Exercise Price (Details)	6 Months Ended
Jun. 30, 2018 $ / shares shares
$20.00
Stock options exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 20.00
Stock options exercisable and vested
Number of Shares \| shares	2,531,795
Weighted-Average Remaining Life (in years)	1 year 11 months 12 days
$28.80
Stock options exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 28.80
Stock options exercisable and vested
Number of Shares \| shares	120,000
Weighted-Average Remaining Life (in years)	2 years 9 months 26 days
$20.00 - $28.80
Stock options exercisable and vested
Number of Shares \| shares	2,651,795
Weighted-Average Remaining Life (in years)	1 year 11 months 27 days
Minimum \| $20.00 - $28.80
Stock options exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 20.00
Maximum \| $20.00 - $28.80
Stock options exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 28.80

Represents the exercise price for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards.

No definition available.

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- References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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