Employee 401(k) Plan (Details) - US Plans Member $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
401 (k) plan, maximum annual contribution per employee (percent)	90.00%
401(k) plan, employer matching contribution, percent of match	25.00%
401(k) plan, employer matching contribution, percent of employees' gross pay	6.00%
401(k) plan, company's matching contributions	$ 1.1