Common Stock and Dividends - Dividend Declared and Paid (Details) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Dividends declared (in dollars per share)	$ 0.12			$ 0.11			$ 0.36	$ 0.33
Dividends paid (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.11	$ 0.11	$ 0.11	$ 0.36	$ 0.33