Revenue from Contracts with Customers Cumulative Effect Transition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017	Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivables, Net, Current	$ 1,151,860		$ 1,151,860			$ 1,042,781
Prepaid Expense and Other Assets	326,623		326,623			515,930
Other assets	208,274		208,274			134,011
Accounts Payable, Current	284,203		284,203			218,996
Deferred Income Taxes and Other Liabilities, Noncurrent	371,381		371,381			365,674
Retained Earnings	5,275,824		5,275,824			$ 4,938,866
Revenues	1,367,727	$ 1,291,994	2,660,588	$ 2,552,480
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(214,884)	$ (252,049)	$ (414,963)	$ (495,059)
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description			In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 replaced most existing revenue recognition guidance in U.S. GAAP. The new standard introduces a five-step process to be followed in determining the amount and timing of revenue recognition. It also provides guidance on accounting for costs incurred to obtain or fulfill contracts with customers, and establishes disclosure requirements which are more extensive than those required under prior U.S. GAAP
New Accounting Pronouncement or Change in Accounting Principle, Description of Transition Method			We selected the modified retrospective (cumulative effect) transition method of adoption. Such method provides that the cumulative effect from prior periods upon applying the new guidance to contracts which were not complete as of the adoption date, be recognized in our condensed consolidated balance sheets as of December 31, 2017, including an adjustment to retained earnings
Receivables, Net, Current					$ (79,492)
Prepaid Expense and Other Assets					(2,253)
Other assets					81,157
Accounts Payable, Current					(9,361)
Deferred Income Taxes and Other Liabilities, Noncurrent					1,173
Retained Earnings					$ 7,600
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	21,000		$ 64,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 15,000		$ 13,000