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Deferred Compensation Plan	12 Months Ended
Deferred Compensation Plan	Dec. 31, 2017
Deferred Compensation Arrangements [Abstract]
Deferred Compensation Plan	Deferred Compensation Plan In April 2005, Basic established a deferred compensation plan for certain employees. Participants may defer up to 50% of their salary and 100% of any cash bonuses. Basic may make contributions of 100% of the first 3% of the participants’ deferred pay and 50% of the next 2% of the participants’ deferred pay to a maximum match of $10,000 per year. Employer matching contributions and earnings thereon are subject to a five-year vesting schedule with full vesting occurring after five years of service. Basic elected to suspend matching for this plan during 2016. Increases in the market value of the deferred employee contributions represented an expense to Basic of $1.1 million, $0.5 million and $0.2 million in 2017, 2016 and 2015, respectively.