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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
$ / shares
Jun. 30, 2017
USD ($)
shares
$ / shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Subsequent Event [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid | $ / shares [1] $ 0.950 $ 0.950      
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.01   $ 0.01   $ 0.01
Proceeds from Issuance or Sale of Equity     $ 464,023 $ 323,798  
Common Stock [Member]          
Subsequent Event [Line Items]          
Dividends Payable, Date to be Paid [1] Jun. 30, 2017 Mar. 31, 2017      
Dividends Payable, Date of Record [1] Jun. 16, 2017 Mar. 17, 2017      
Dividends Payable, Date Declared [1] May 18, 2017 Feb. 17, 2017      
Stock Issued During Period, Shares, New Issues | shares 4,750,000   4,992,300    
Proceeds from Issuance or Sale of Equity $ 47   $ 51    
Lightower Acquisition [Member]          
Subsequent Event [Line Items]          
Fiber Miles Acquired     32,000    
3.200% Senior Unsecured Notes [Member] | Issuance of debt obligation [Member]          
Subsequent Event [Line Items]          
Debt Instrument, Issuance Date     Aug. 01, 2017    
3.200% Senior Unsecured Notes [Member] | Issuance of debt obligation [Member]          
Subsequent Event [Line Items]          
Debt Instrument, Face Amount         $ 750,000
Debt Instrument, Interest Rate, Stated Percentage         0.00%
Debt Instrument, Maturity Date         Jan. 01, 2024
3.650% Senior Unsecured Notes [Member] | Issuance of debt obligation [Member]          
Subsequent Event [Line Items]          
Debt Instrument, Face Amount         $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage         0.00%
Debt Instrument, Maturity Date         Jan. 01, 2027
July 2017 Equity Offering [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Sale of Stock, Transaction Date     Jul. 26, 2017    
Stock Issued During Period, Shares, New Issues | shares     40,150,000    
Proceeds from Issuance or Sale of Equity     $ 3,800,000    
July 2017 Equity Offering [Member] | Preferred Stock [Member]          
Subsequent Event [Line Items]          
Sale of Stock, Transaction Date     Jul. 26, 2017    
Stock Issued During Period, Shares, New Issues | shares     1,650,000    
Preferred Stock, Dividend Rate, Percentage     6.875%    
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.01   $ 0.01    
Preferred Stock, Per Share Sales Price | $ / shares     $ 1,000    
Proceeds from Issuance of Preferred Stock and Preference Stock     $ 1,600,000    
May 2017 Equity Offering [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Sale of Stock, Transaction Date May 01, 2017        
Stock Issued During Period, Shares, New Issues | shares 4,750,000        
Proceeds from Issuance or Sale of Equity $ 442,000        
Lightower Acquisition [Member]          
Subsequent Event [Line Items]          
Business Combination, Consideration Transferred     $ 7,100,000    
Dividend Declared [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Dividends Payable, Date to be Paid Sep. 29, 2017        
Dividends Payable, Date of Record Sep. 15, 2017        
Dividends Payable, Date Declared Aug. 03, 2017        
Paid subsequent to year end [Member]          
Subsequent Event [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 0.950        
Minimum [Member]          
Subsequent Event [Line Items]          
Conversion factor, Preferred Stock | shares     8.6806    
Maximum [Member]          
Subsequent Event [Line Items]          
Conversion factor, Preferred Stock | shares     10.4167    
[1] Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid at the time the restricted stock units vest.