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Goodwill - Schedule of Reporting Units Goodwill Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 6,638,592	$ 6,610,279	$ 6,015,375
Percentage Change In Operating Income Used To Evaluate Fair Value Of Reporting Unit For Goodwill Assessment	3.00%
Percentage Change In Discount Rate Used To Evaluate Fair Value Of Reporting Unit For Goodwill Assessment	1.00%
GERMANY
Goodwill [Line Items]
Goodwill	$ 337,619
Carrying amount coverage	13.70%
Sensitivities, operating income	(1.60%)
Sensitivities, discount rate	(11.10%)
PORTUGAL
Goodwill [Line Items]
Goodwill	$ 48,066
Carrying amount coverage	16.90%
Sensitivities, operating income	(1.90%)
Sensitivities, discount rate	(6.00%)
POLAND
Goodwill [Line Items]
Goodwill	$ 47,669
Carrying amount coverage	11.80%
Sensitivities, operating income	(1.90%)
Sensitivities, discount rate	(6.00%)

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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