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Stockholders' Equity (Details)	6 Months Ended
	Jun. 30, 2018 transaction	Nov. 30, 2017 USD ($)	Jun. 30, 2015 USD ($)
Common Class A [Member]
Class of Stock [Line Items]
Share repurchase program authorized amount			$ 150,000,000
ASR transaction accounted for as a treasury stock repurchase		$ 150,000,000
Accelerated Share Repurchase Agreement [Member]
Class of Stock [Line Items]
Stock repurchase program, number of transactions | transaction	2

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Stock Repurchase Program, Number of Transactions

+ References

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Amount of stock repurchase plan authorized.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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