Stockholders' Equity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Equity [Abstract]
Shares paid for tax withholding for share based compensation	280,622	338,523
Shares paid for tax withholding for share based compensation, average price	$ 58.06	$ 36.22
Forfeited restricted stock awards transferred to treasury stock	193,489	132,626
Par value of treasury stock	$ 0.01		$ 0.01