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Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill impairment charges	$ 601,040	$ 0	$ 686,355	$ 253,000	$ 281,415
Goodwill	9,415,877		9,415,877		9,407,317	$ 9,294,479
DMG
Goodwill [Line Items]
Goodwill impairment charges			651,659		253,000
Goodwill	2,873,032		2,873,032		$ 3,391,942	$ 3,398,264
CALIFORNIA | DMG
Goodwill [Line Items]
Tax expense related to the California impairment charges	218,134
Goodwill impairment charges	560,756	$ 0	560,756	$ 0
Impact on net (loss) income	382,906
Goodwill	$ 1,888,609		$ 1,888,609

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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
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