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Stockholders' Equity Matters - Dividends Declared (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Jul. 02, 2018 USD ($) | May 24, 2018 $ / shares | Apr. 02, 2018 USD ($) | Feb. 14, 2018 $ / shares | Jan. 02, 2018 USD ($) | Dec. 12, 2017 USD ($) bank $ / shares shares | Oct. 24, 2017 $ / shares | Oct. 02, 2017 USD ($) | Jul. 27, 2017 $ / shares | Jul. 03, 2017 USD ($) | May 24, 2017 $ / shares | Apr. 03, 2017 USD ($) | Feb. 15, 2017 $ / shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 $ / shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares | Dec. 31, 2017 $ / shares shares | Oct. 31, 2017 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared per Common Share (in dollars per share) | $ / shares |  | $ 0.5875 |  | $ 0.5875 |  |  | $ 0.5875 |  | $ 0.55 |  | $ 0.55 |  | $ 0.55 | $ 0.5877 | $ 0.5504 | $ 1.1765 | $ 1.1008 |  |
Dividends, Common Stock | $ 168,078,000 |  | $ 167,969,000 |  | $ 166,319,000 |  |  | $ 146,772,000 |  | $ 145,417,000 |  | $ 145,235,000 |  |  |  | $ 338,251,000 | $ 291,729,000 |  |
Common stock, issued shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 286,099,227 |  | 286,099,227 |  | 283,110,183 |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
At The Market (ATM) Equity Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Common stock, issued shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 273,486 |  | 273,486 |  |  |
Sale Of Stock Consideration Received On Transaction, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,800,000 |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,716,000 |  |  |  |  |
Payment of Stock Trading Commission Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000 |  |  |  |  |
Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 431,200,000 |  | $ 431,200,000 |  |  |
Number Of Banks |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  | $ 516,462,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Banks | bank |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | shares |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  | $ 37.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs Per Share | $ / shares |  |  |  |  |  | $ 1.38195 |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  | $ 76,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | shares |  |  |  |  |  | 2,175,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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