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Statement of Cash Flows	12 Months Ended
Statement of Cash Flows	Dec. 31, 2017
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Statement of Cash Flows	Statement of Cash Flows Supplemental disclosure of non-cash investing and financing activities Included in accounts payable and accrued expenses as of December 31, 2017, 2016, and 2015 were $41.8 million, $28.2 million, and $50.7 million, respectively, of accrued capital expenditures. The Company recognized additional capital and facility lease obligations of $201.2 million, $154.9 million, and $26.0 million during 2017, 2016 and 2015, respectively, in connection with the Company's Tarrytown Leases (see Note 12).