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Defined Contribution Retirement Plan	12 Months Ended
Defined Contribution Retirement Plan	Dec. 31, 2015
Defined Contribution Retirement Plan
Defined Contribution Retirement Plan	10. Defined Contribution Retirement Plan The Company has a qualified defined contribution retirement plan that covers substantially all of its employees. Expense for the Company’s matching contributions, which in part are based on amounts of compensation contributed by plan participants, was $2.6 million, $2.2 million, and $2.3 million for the years ended December 31, 2015, 2014, and 2013, respectively.