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Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Acquisitions [Abstract] |  |  |
Acquisitions of towers and related intangible assets | $ 406,699 | $ 392,902 | $ 214,686
Land buyouts and other assets | 45,130 | 48,645 | 62,149
Total cash acquisition capital expenditures | 451,829 | 441,547 | 276,835
Acquisition costs paid through the issuance of common stock |  | $ 63,300 |
Common stock issued for acquisition costs |  | 487,963 |
Ground lease extensions | $ 24,300 | $ 18,800 | $ 14,100

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- Definition Ground lease land purchases. + References No definition available. + Details
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- Definition Towers and related intangible assets acquisitions. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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