Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.62	$ 0.545	$ 0.375
Common stock issued, price per share (in USD per share)	$ 34.32	$ 35.87	$ 33.81