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Stockholders' Equity - Summary of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends Payable [Line Items] |  |  |
Payment of dividends to stockholders | $ 175,775 | $ 150,159 | $ 108,527
February 7, 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Feb. 07, 2017 |  |
Dividend Per Share | $ 0.28 |  |
Record Date | Mar. 09, 2017 |  |
Payment of dividends to stockholders | $ 42,247 |  |
Payment Date | Mar. 30, 2017 |  |
April 26, 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Apr. 26, 2017 |  |
Dividend Per Share | $ 0.28 |  |
Record Date | May 25, 2017 |  |
Payment of dividends to stockholders | $ 42,438 |  |
Payment Date | Jun. 15, 2017 |  |
July 26, 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Jul. 26, 2017 |  |
Dividend Per Share | $ 0.30 |  |
Record Date | Aug. 24, 2017 |  |
Payment of dividends to stockholders | $ 45,578 |  |
Payment Date | Sep. 14, 2017 |  |
October 25, 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Oct. 25, 2017 |  |
Dividend Per Share | $ 0.30 |  |
Record Date | Nov. 16, 2017 |  |
Payment of dividends to stockholders | $ 45,512 |  |
Payment Date | Dec. 07, 2017 |  |
February 8, 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Feb. 08, 2016 |
Dividend Per Share |  | $ 0.24 |
Record Date |  | Mar. 10, 2016 |
Payment of dividends to stockholders |  | $ 36,174 |
Payment Date |  | Mar. 30, 2016 |
April 26, 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Apr. 26, 2016 |
Dividend Per Share |  | $ 0.24 |
Record Date |  | May 26, 2016 |
Payment of dividends to stockholders |  | $ 35,773 |
Payment Date |  | Jun. 16, 2016 |
July 27, 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Jul. 27, 2016 |
Dividend Per Share |  | $ 0.26 |
Record Date |  | Aug. 25, 2016 |
Payment of dividends to stockholders |  | $ 39,062 |
Payment Date |  | Sep. 15, 2016 |
October 24, 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Oct. 24, 2016 |
Dividend Per Share |  | $ 0.26 |
Record Date |  | Nov. 17, 2016 |
Payment of dividends to stockholders |  | $ 39,150 |
Payment Date |  | Dec. 08, 2016 |
February 4, 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Feb. 04, 2015
Dividend Per Share |  |  | $ 0.18
Record Date |  |  | Mar. 10, 2015
Payment of dividends to stockholders |  |  | $ 22,895
Payment Date |  |  | Mar. 26, 2015
April 29, 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Apr. 29, 2015
Dividend Per Share |  |  | $ 0.18
Record Date |  |  | May 28, 2015
Payment of dividends to stockholders |  |  | $ 23,096
Payment Date |  |  | Jun. 18, 2015
July 29, 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Jul. 29, 2015
Dividend Per Share |  |  | $ 0.24
Record Date |  |  | Aug. 27, 2015
Payment of dividends to stockholders |  |  | $ 31,182
Payment Date |  |  | Sep. 17, 2015
October 29, 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Oct. 29, 2015
Dividend Per Share |  |  | $ 0.24
Record Date |  |  | Nov. 19, 2015
Payment of dividends to stockholders |  |  | $ 31,354
Payment Date |  |  | Dec. 10, 2015

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