Stockholders' Equity - Summary of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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