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Stockholders' Equity Matters - Dividends Declared (Details) $ / shares in Units, $ in Thousands												3 Months Ended
	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	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2017 $ / shares shares	Oct. 31, 2017 USD ($)
Subsequent Event [Line Items]
Dividends Declared per Common Share (in dollars per share) | $ / shares		$ 0.5875			$ 0.5875		$ 0.55		$ 0.55		$ 0.55	$ 0.5888	$ 0.5504
Dividends, Common Stock			$ 166,319			$ 146,772		$ 145,417		$ 145,235		$ 169,044	$ 145,427
Common stock, issued shares | shares												285,923,405		283,110,183
Common Stock, Par or Stated Value Per Share | $ / shares												$ 0.01		$ 0.01
Subsequent Event
Subsequent Event [Line Items]
Dividends, Common Stock	$ 167,969
At The Market (ATM) Equity Program [Member]
Subsequent Event [Line Items]
Sale of Stock, Authorized Amount															$ 500,000
Common stock, issued shares | shares												273,486
Sale Of Stock Consideration Received On Transaction, Gross												$ 8,800
Sale of Stock, Consideration Received on Transaction												8,716
Payment of Stock Trading Commission Costs												90
Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution												$ 431,200
Equity Offering [Member]
Subsequent Event [Line Items]
Sale of Stock, Consideration Received on Transaction				$ 516,462
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]
Subsequent Event [Line Items]
Sale of Stock, Consideration Received on Transaction			$ 76,200
Sale of Stock, Number of Shares Issued in Transaction | shares				2,175,000

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