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Stock-Based Compensation and Awards (Tables)

12 Months Ended

Dec. 31, 2014

Stock-Based Compensation and Awards

Summary of stock-based compensation expense included in results of operations

The following table presents the stock-based compensation expense included in our results of operations (in thousands):

		Years Ended December 31,
		2014			2013			2012
Stock options		$	1,714		$	2,241		$	2,552
Restricted stock, restricted stock units, performance units, cash settled restricted stock units, cash settled performance units and phantom units		25,087			20,518			16,583
Employee stock purchase plan		175			142			114
Total stock-based compensation expense		$	26,976		$	22,901		$	19,249

Schedule of weighted average assumptions

		Years Ended December 31,
		2014		2013		2012
Expected life in years		4.5		4.5		4.5
Risk-free interest rate		1.33	%	0.66	%	0.78	%
Volatility		46.51	%	49.19	%	47.96	%
Dividend yield		1.5	%	0.0	%	0.0	%

Summary of stock option activity

The following table presents stock option activity during the year ended December 31, 2014:

		Stock Options (in thousands)		Weighted Average Exercise Price Per Share			Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Options outstanding, January 1, 2014		2,152		$	28.27
Granted		107		41.18
Exercised		(730	)	17.57
Cancelled		(34	)	73.54
Options outstanding, December 31, 2014		1,495		33.39			2.6		$	12,993
Options exercisable, December 31, 2014		1,251		33.95			2.1		11,567

Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance award activity

The following table presents restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity during the year ended December 31, 2014:

		Shares (in thousands)		Weighted Average Grant-Date Fair Value Per Share
Non-vested awards, January 1, 2014		1,672		$	18.97
Granted		459		41.35
Vested		(897	)	18.98
Cancelled		(64	)	25.86
Non-vested awards, December 31, 2014(1)		1,170		27.37

(1) Non-vested awards as of December 31, 2014 are comprised of 208,000 cash settled restricted stock units and cash settled performance units and 962,000 restricted shares, restricted stock units and performance units.

Schedule of phantom unit activity

The following table presents phantom unit activity during the year ended December 31, 2014:

		Phantom Units (in thousands)		Weighted Average Grant-Date Fair Value per Unit
Phantom units outstanding, January 1, 2014		85		$	23.72
Granted		55		30.50
Vested		(48	)	24.47
Phantom units outstanding, December 31, 2014		92		27.38

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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