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Retirement benefits	12 Months Ended
Retirement benefits	Dec. 31, 2013
Disclosure Retirement Benefits Additional Information [Abstract]
Retirement benefits	Retirement benefits We provide a 401(k) retirement plan for all employees, and during 2013, we matched employee contributions 100%, up to 7% of each employee’s gross wages, an increase from 6% and 6% during 2012 and 2011, respectively. At December 31, 2013, 2012, and 2011, there were 585, 661, and 625 employees, respectively, participating in the plan. Our contribution expense was $3,621, $2,809, and $2,390 for the years ended December 31, 2013, 2012 and 2011, respectively.