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Stockholders' Equity Matters - Dividends Declared (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
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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 ($) bank | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Per Share (in dollars per share) | $ / shares |  | $ 0.6110 |  | $ 0.6110 |  | $ 0.6110 |  | $ 0.5875 |  | $ 0.5875 |  | $ 0.5875 |  |  |  |  |
Total Amount |  |  | $ 175,242 |  | $ 174,935 |  | $ 168,148 |  | $ 168,078 |  | $ 167,969 |  |  | $ 176,642 | $ 169,207 | $ 353,102 | $ 338,251
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Amount | $ 175,389 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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