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Profit Sharing Plan	12 Months Ended
Profit Sharing Plan	Dec. 31, 2015
Profit Sharing Plan [Abstract]
Profit Sharing Plan	12.Profit Sharing Plan Basic has a 401(k) profit sharing plan that covers substantially all employees. Employees may contribute up to their base salary not to exceed the annual Federal maximum allowed for such plans. At management’s discretion, Basic may make a matching contribution proportional to each employee’s contribution. Employee contributions are fully vested at all times. Employer matching contributions vest incrementally, with full vesting occurring after five years of service. Employer contributions to the 401(k) plan approximated $407,000, $4.0 million, and $3.4 million in 2015, 2014 and 2013, respectively.