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Employment Benefits	12 Months Ended
Employment Benefits	Dec. 31, 2015
Employment Benefits [Abstract]
Employment Benefits	8. Employment Benefits We have an employee 401(k) salary deferral plan, covering all employees. Employees may make contributions by withholding a percentage of their salary up to the IRS annual limit ($18,000 and $24,000 in 2015 for employees under 50 years old and employees 50 years old or over, respectively). We made approximately $1.5 million, $1.0 million and $0.6 million in matching contributions for the years ended December 31, 2015, 2014 and 2013, respectively.