Share-Based Compensation

6 Months Ended

Jun. 30, 2015

Note 7 Share-Based Compensation

We have several share-based employee and director compensation plans, which are more fully described in Note 9 — Share-Based Compensation in our 2014 Annual Report. Total share-based compensation expense, which includes stock options and restricted stock, totaled $16.4 million and $8.6 million for the three months ended June 30, 2015 and 2014, respectively, and $30.1 million and $19.3 million for the six months ended June 30, 2015 and 2014, respectively. Share-based compensation expense has been allocated to our various operating segments. See Note 15 — Segment Information.

Stock Options

The total intrinsic value of stock options exercised during the six months ended June 30, 2015 and 2014 was $0.8 million and $46.9 million, respectively. The total fair value of stock options that vested during the six months ended June 30, 2015 and 2014 was $1.6 million and $1.5 million, respectively.

Restricted Stock

During the six months ended June 30, 2015 and 2014, we awarded 2,535,503 and 1,143,002 shares of restricted stock, respectively, vesting over periods of up to four years, to our employees and directors. These awards had an aggregate value at their date of grant of $34.7 million and $26.1 million, respectively. The fair value of restricted stock that vested during the six months ended June 30, 2015 and 2014 was $13.2 million and $18.3 million, respectively. The fair value of these awards is based on the closing price of Nabors stock on the date the awards are granted.

Restricted Stock Based on Performance

During the six months ended June 30, 2015 and 2014, we awarded 438,307 and 362,311 shares of restricted stock, respectively, vesting over a period of three years to some of our executives. The performance awards granted were based upon achievement of specific financial or operational objectives. The number of shares granted was determined by the number of performance goals achieved during fiscal years 2014 and 2013, respectively.

Until shares are vested, our performance awards based on performance conditions are liability-classified awards. Our accrued liabilities included $1.1 million for such awards at June 30, 2015 for the performance period beginning January 1, 2015 through December 31, 2015. The fair value of these awards that vested during the six months ended June 30, 2015 was $3.7 million. The fair value of these awards are estimated at each reporting period, based on internal metrics and marked to market.

Restricted Stock Based on Market Conditions

During the six months ended June 30, 2015 and 2014, we awarded 544,925 and 395,550 shares of restricted stock, respectively, which will vest based on our performance compared to our peer group over a three-year period. These awards had an aggregate value at their date of grant of $4.7 million and $4.5 million, respectively, after consideration of all assumptions.

The grant date fair value of these awards was based on a Monte Carlo model, using the following assumptions:

	Three Months Ended
	June 30,
	2015			2014
Risk free interest rate	1.18		%	0.80		%
Expected volatility	50.00		%	40.00		%
Closing stock price at grant date	$	12.98		$	18.19
Expected term (in years)	3.0 years			2.97 years