STOCK-BASED COMPENSATION

Stock Options

Changes in our stock options for the three months ended September 30, 2018 were as follows:



	Options		Weighted Average Exercise Price		Weighted Average Remaining Life (years)	Aggregate Intrinsic value (in thousands)
Options outstanding, June 30, 2018	989,992		$	33.08
Exercised	(107,880	)	29.45
Options outstanding, September 30, 2018	882,112		$	33.53	4.9	$	9,066
Options vested and expected to vest, September 30, 2018	882,112		$	33.53	4.9	$	9,066
Options exercisable, September 30, 2018	834,539		$	34.35	4.7	$	7,907

During the three months ended September 30, 2018 and 2017, compensation expense related to stock options was $0.1 million and $0.2 million, respectively. As of September 30, 2018, the total unrecognized compensation cost related to options outstanding was immaterial and is expected to be recognized over a weighted average period of 0.5 years.

Fair value of options vested during the three months ended September 30, 2018 and 2017 was $1.0 million and $1.6 million, respectively. The amount of cash received from the exercise of capital stock options during the three months ended September 30, 2018 was $3.1 million and was immaterial for the three months ended September 30, 2017. The total intrinsic value of options exercised during the three months ended September 30, 2018 was $1.4 million and was immaterial during the three months ended September 30, 2017.

Restricted Stock Units – Performance Vesting and Time Vesting

Changes in our performance vesting and time vesting restricted stock units for the three months ended September 30, 2018 were as follows:



	Performance Vesting Stock Units		Performance Vesting Weighted Average Fair Value		Time Vesting Stock Units		Time Vesting Weighted Average Fair Value
Unvested, June 30, 2018	409,297		$	31.22	1,083,675		$	30.47
Granted	147,769		37.74		419,069		37.79
Vested	(36,394	)	31.13		(425,891	)	31.73
Performance metric adjustments, net	41,196		29.06		—		—
Forfeited	(44,179	)	31.04		(15,418	)	32.21
Unvested, September 30, 2018	517,689		$	32.93	1,061,435		$	32.85

During the three months ended September 30, 2018 and 2017, compensation expense related to time vesting and performance vesting restricted stock units was $7.8 million and $6.0 million, respectively. As of September 30, 2018, the total unrecognized compensation cost related to unvested time vesting and performance vesting restricted stock units was $26.1 million and is expected to be recognized over a weighted average period of 2.3 years.