CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interest	Common Class A Common Stock	Common Class B [Member] Common Stock	ATS Acquisition	ATS Acquisition Total Stockholders' Equity	ATS Acquisition Paid-in Capital	ATS Acquisition Retained Earnings
Dividends	$ (1,499,935)	$ (1,499,935)	$ (963,711)	$ (536,224)
Payments for Repurchase of Common Stock	240,799	240,799	240,666	0	$ 0	$ 0	$ (133)	$ 0
Acquisitionofi24	14,369	14,369	(61,049)	(73,578)	(1,840)
Beginning balance (As Reported) at Dec. 31, 2017	5,495,840	5,494,301	4,642,128	854,824	(10,022)	1,539	2,470	4,901
Beginning balance (Restatement Adjustment)									$ (3,753)	$ (3,753)	$ 23,101	$ (26,854)
Beginning balance (Restatement Adjustment, Impact of ASC 606)	12,666	12,666		12,666
Beginning balance at Dec. 31, 2017	5,504,753	5,503,214	4,665,229	840,636	(10,022)	1,539	2,470	4,901
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to stockholders	(194,253)	(194,253)		(194,253)
Net loss attributable to noncontrolling interests	1,039					1,039
Proceeds from (Payments to) Noncontrolling Interests	5,995					5,995
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss) Due to Settlements, Net of Tax	10,748
Pension liability adjustments, net of income taxes	11,734
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	986
Share-based compensation expense	46,176	46,176	46,176
Redeemable equity vested	(72,924)	(72,924)	(72,924)
Other changes to equity	(859)	(859)	(859)	0
Adoption of ASU No. 2018-02				2,163	(2,163)
Ending balance at Sep. 30, 2018	3,670,973	3,662,400	3,618,709	$ 38,744	$ (2,291)	$ 8,573	5,107	2,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Shares Exchanged fro Class A	0						$ 2,770	$ (2,770)
Redeemable Equity Vested	$ 124,415	$ 124,415	$ 124,415