Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 0.240	$ 0.220	$ 0.200
Purchase of common stock, shares	0	225,000	1,200,000
Equity compensation activity, shares	168,219	185,382	524,448