Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends, Common Stock	$ 376,012	$ 367,767	$ 320,666
Common Stock Dividends Declared (in dollars per share)	$ 0.670	$ 0.670	$ 0.585