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Stockholders' Equity Matters - Dividends Declared (Details)																1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 02, 2018 USD ($)	Jul. 24, 2018 $ / shares	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	Oct. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 $ / shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares	Dec. 31, 2017 $ / shares shares
Subsidiary or Equity Method Investee [Line Items]
Dividends Declared per Common Share (in dollars per share) | $ / shares		$ 0.5875		$ 0.5875		$ 0.5875			$ 0.5875		$ 0.55		$ 0.55		$ 0.55		$ 0.5876	$ 0.5534	$ 1.7641	$ 1.6543
Dividends, Common Stock			$ 168,078,000		$ 167,969,000		$ 166,319,000			$ 146,772,000		$ 145,417,000		$ 145,235,000					$ 507,437,000	$ 439,327,000
Common stock, issued shares | shares																	286,221,058		286,221,058		283,110,183
Common Stock, Par or Stated Value Per Share | $ / shares																	$ 0.01		$ 0.01		$ 0.01
Subsequent Event
Subsidiary or Equity Method Investee [Line Items]
Dividends, Common Stock	$ 168,148,000
At The Market (ATM) Equity Program [Member]
Subsidiary or Equity Method Investee [Line Items]
Sale of Stock, Authorized Amount																$ 500,000,000
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
Sale of Stock, Number of Shares Issued in Transaction | shares																	0		273,486
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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