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Basis of Presentation and Consolidation (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Retained Earnings | Accounting Standards Update 2016-16
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of new accounting principle					$ 3,200,000
Subsequent Event
New Accounting Pronouncement, Early Adoption [Line Items]
Capitalized contract costs				$ 700,000
Subsequent Event | Retained Earnings | Accounting Standards Update 2014-09
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of new accounting principle			$ 10,100,000
Escrow
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash held in escrow	$ 0	$ 0			$ 30,000,000
Decrease in escrow	$ 6,200,000	$ (23,800,000)

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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