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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 16, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		59,957,887		59,389,830
Investor | WPP
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)		11,319,363
Ownership percentage common stock outstanding shares		18.90%
Interest expense		$ 0	$ 219
Investor | Starboard Value LP
Related Party Transaction [Line Items]
Interest expense		$ 6,700	$ 2,900
Affiliated entity | Lightspeed
Related Party Transaction [Line Items]
Purchase commitment term		5 years
Annual purchase obligation		$ 5,000
Beneficial owner | Starboard Value LP
Related Party Transaction [Line Items]
Ownership percentage common stock outstanding shares	5.00%

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- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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