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Stock-based Compensation and Awards (Tables)

12 Months Ended

Dec. 31, 2012

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,
		2012			2011			2010
Stock options		$	2,552		$	3,916		$	5,273
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units		16,583			14,970			17,796
Employee stock purchase plan		114			278			282
Total stock-based compensation expense		$	19,249		$	19,164		$	23,351

Schedule of weighted average assumptions

		Years Ended December 31,
		2012		2011		2010
Expected life in years		4.5		4.5		4.5
Risk-free interest rate		0.78	%	1.23	%	2.13	%
Volatility		47.96	%	45.17	%	42.94	%
Dividend yield		0.0	%	0.0	%	0.0	%

Summary of stock option activity

The following table presents stock option activity for the year ended December 31, 2012 (in thousands, except per share data and remaining life in years):

		Stock Options		Weighted Average Exercise Price			Weighted Average Remaining Life		Aggregate Intrinsic Value
Options outstanding, December 31, 2011		3,271		$	27.39
Granted		153		14.36
Exercised		(34	)	16.41
Cancelled		(806	)	26.55
Options outstanding, December 31, 2012		2,584		27.02			4.6		$	10,866
Options exercisable, December 31, 2012		1,828		31.99			3.6		5,425

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

The following table presents restricted stock, restricted stock unit, cash settled restricted stock unit and cash settled performance award activity for the year ended December 31, 2012 (in thousands, except per share data):

		Shares		Weighted Average Grant-Date Fair Value Per Share
Non-vested awards, December 31, 2011		1,670		$	19.49
Granted		1,221		14.33
Vested		(772	)	19.09
Change in expected vesting of cash settled performance awards		44		14.36
Cancelled		(171	)	22.39
Non-vested awards, December 31, 2012(1)		1,992		16.12

(1) Non-vested awards as of December 31, 2012 are comprised of 545 thousand cash settled restricted stock units and cash settled performance awards and 1,447 thousand restricted stock shares and stock settled restricted stock units.

Schedule of phantom unit activity

		Phantom Units		Weighted Average Grant-Date Fair Value per Unit
Phantom units outstanding, December 31, 2011		75,267		$	21.45
Granted		29,717		22.62
Vested		(40,329	)	18.73
Cancelled		(771	)	28.50
Phantom units outstanding, December 31, 2012		63,884		23.62

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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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