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Stockholders' Equity Matters - Dividends Declared (Details) $ / shares in Units, $ in Thousands															1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 02, 2019 USD ($)	Jul. 26, 2019 $ / shares	Jul. 02, 2019 USD ($)	May 22, 2019 $ / shares	Apr. 02, 2019 USD ($)	Feb. 07, 2019 $ / shares	Jan. 03, 2019 USD ($)	Oct. 25, 2018 $ / shares	Oct. 02, 2018 USD ($)	Jul. 24, 2018 $ / shares	Jul. 02, 2018 USD ($)	May 24, 2018 $ / shares	Apr. 02, 2018 USD ($)	Feb. 14, 2018 $ / shares	Oct. 31, 2017 USD ($) bank	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)
Subsidiary or Equity Method Investee [Line Items]
Dividend Per Share (in dollars per share) | $ / shares		$ 0.6110		$ 0.6110		$ 0.6110		$ 0.6110		$ 0.5875		$ 0.5875		$ 0.5875
Total Amount			$ 175,389		$ 175,242		$ 174,935		$ 168,148		$ 168,078		$ 167,969			$ 176,665	$ 169,186	$ 529,767	$ 507,437
Subsequent Event
Subsidiary or Equity Method Investee [Line Items]
Total Amount	$ 175,434
At The Market (ATM) Equity Program
Subsidiary or Equity Method Investee [Line Items]
Number of banks | bank															10
Aggregate sales price of common stock															$ 500,000
Shares of common stock sold (in shares) | shares																		0
Remaining aggregate sale price of shares of common stock																$ 431,200		$ 431,200

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 505
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-Section S99
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