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Retirement benefits	12 Months Ended
Retirement benefits	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Retirement benefits	Retirement benefits We provide a 401(k) retirement plan for all employees and matched 100% of employee contributions up to 7% of each employee’s gross wages during 2014 and 2013 and matched 6% during 2012. At December 31, 2014, 2013, and 2012, there were 625, 585, and 661 employees, respectively, participating in the plan. Our contribution expense was $3,592, $3,621, and $2,809 for the years ended December 31, 2014, 2013 and 2012, respectively.

The entire disclosure for pension and other postretirement benefits.