Stockholders' Equity - Dividends Declared (Details) - $ / shares |
12 Months Ended | ||||||
---|---|---|---|---|---|---|---|
Dec. 01, 2017 |
Sep. 01, 2017 |
Jun. 02, 2017 |
Mar. 03, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Equity [Abstract] | |||||||
Dividends paid per common share (in dollars per share) | $ 0.395 | $ 0.3925 | $ 0.39 | $ 0.3875 | $ 1.565 | $ 1.525 | $ 0.517 |