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Stock-Based Compensation and Awards (Tables)

12 Months Ended

Dec. 31, 2013

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,
		2013			2012			2011
Stock options		$	2,241		$	2,552		$	3,916
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units		20,518			16,583			14,970
Employee stock purchase plan		142			114			278
Total stock-based compensation expense		$	22,901		$	19,249		$	19,164

Schedule of weighted average assumptions

		Years Ended December 31,
		2013		2012		2011
Expected life in years		4.5		4.5		4.5
Risk-free interest rate		0.66	%	0.78	%	1.23	%
Volatility		49.19	%	47.96	%	45.17	%
Dividend yield		0.0	%	0.0	%	0.0	%

Summary of stock option activity

		Stock Options (in thousands)		Weighted Average Exercise Price Per Share			Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Options outstanding, December 31, 2012		2,584		$	27.02
Granted		177		25.04
Exercised		(459	)	18.12
Cancelled		(150	)	33.94
Options outstanding, December 31, 2013		2,152		28.27			3.4		$	26,522
Options exercisable, December 31, 2013		1,696		31.27			2.9		18,742

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

		Shares (in thousands)		Weighted Average Grant-Date Fair Value Per Share
Non-vested awards, December 31, 2012		1,992		$	16.12
Granted		702		25.10
Vested		(924	)	17.56
Change in expected vesting of cash settled performance awards		20		25.04
Cancelled		(118	)	19.33
Non-vested awards, December 31, 2013(1)		1,672		18.97

(1) Non-vested awards as of December 31, 2013 are comprised of 419 thousand cash settled restricted stock units and cash settled performance awards and 1,253 thousand restricted stock shares and restricted stock units.

Schedule of phantom unit activity

		Phantom Units (in thousands)		Weighted Average Grant-Date Fair Value per Unit
Phantom units outstanding, December 31, 2012		64		$	23.62
Granted		55		23.76
Vested		(28	)	23.45
Cancelled		(6	)	24.31
Phantom units outstanding, December 31, 2013		85		23.72

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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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