Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Jan. 10, 2018	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash Paid for Acquisitions, Net of Cash Acquired			$ 39,423	$ 1,428,974
Accrued Purchase Price and Other Holdbacks			1,042	$ 149
Fair Value of Identifiable Assets Acquired:
Operating lease right-of-use assets (see Note 2.d.)			1,791,536		$ 1,825,721
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)			1,656,659		$ 1,685,771
Goodwill			4,465,378			$ 4,441,030
2019 Acquisitions
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)			31,900
Cash Paid for Acquisitions, Net of Cash Acquired			34,198
Accrued Purchase Price and Other Holdbacks			1,042
Total Consideration			35,240
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			2,273
Fair Value of Identifiable Assets Acquired:
Cash			2,273
Accounts Receivable and Prepaid Expenses			2,845
Property, Plant and Equipment			4,039
Customer Relationship Intangible Assets			13,589
Operating lease right-of-use assets (see Note 2.d.)			10,541
Accounts Payable, Accrued Expenses and Other Liabilities			(2,065)
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)			(10,541)
Deferred Income Taxes			1,574
Total Fair Value of Identifiable Net Assets Acquired			19,107
Goodwill			16,133
Payments for (Proceeds from) Previous Acquisition			$ 7,498
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Total Consideration	$ 1,347,000	$ 31,000