Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - $ / shares	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividend declared (in dollars per share)	$ 0.3050	$ 0.5925	$ 1.1325
Deferred compensation plan held Rabbi Trust (shares)	79,658	79,658	70,631
Shares issued under the performance incentive plan withheld for employee taxes (shares)		12,031	12,620