Incentive Plan (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Options Outstanding

The following table reflects changes during the three-month period and a summary of stock options outstanding at March 31, 2019:

				Weighted
				Average
		Weighted		Remaining	Aggregate
	Number of	Average		Contractual	Intrinsic
	Options	Exercise		Term	Value
Non-statutory stock options:	Granted	Price		(Years)	(000's)
Outstanding, beginning of period	595,736	$	39.23
Options granted	—	—
Options forfeited	(6,474)	$	40.12
Options exercised	—	—
Options expired	(71,228)	$	39.23
Outstanding, end of period	518,034	$	39.21	7.8	$—
Exercisable, end of period	347,528	$	39.21	7.8	$—
Vested or expected to vest, end of period	170,506	$	39.23	7.8	$—

Summary of Non-Vested Restricted Stock Units

A summary of the status of Basic’s non-vested restricted stock units at March 31, 2019 and changes during the three months ended March 31, 2019 are presented in the following table:

		Weighted Average
	Number of	Grant Date Fair
Non-vested Units	Restricted Stock Units	Value Per Unit
Non-vested at beginning of period	191,302	$	16.58
Granted during period	—	—
Vested during period	(73,976)	16.17
Forfeited during period	(2,912)	17.31
Non-vested at end of period	114,414	$	16.83

Summary of Non-Vested Performance Stock Units

A summary of the status of Basic’s non-vested performance-based grants at March 31, 2019 and changes during the three months ended March 31, 2019 are presented in the following table:

		Weighted Average
	Number of	Grant Date Fair
Non-vested Units	Performance Stock Units	Value Per Unit
Non-vested at beginning of period	682,985	$	27.27
Granted during period	—	—
Vested during period	(218,541)	36.33
Forfeited during period	(9,764)	26.66
Non-vested at end of period	454,680	$	22.93