Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Share-based Compensation [Abstract]

Rollforward of unvested stock-based compensation awards

A summary of our restricted stock activity during the six months ended June 30, 2012 is presented in the following table:

	Time Vested						Performance Vested
	Weighted average grant date fair value		Restricted shares		Vest date fair value		Weighted average grant date fair value		Restricted shares
	($ per share)						($ per share)
Unvested and outstanding at January 1, 2012	$	680.74	11,585				$	298.15	53,098
Granted	$	747.08	125				$	394.00	278
Vested	$	681.67	(2,498	)	$	1,866	$	—	—
Forfeited	$	685.50	(396	)			$	302.13	(1,499	)
Unvested and total outstanding at June 30, 2012	$	681.20	8,816				$	298.55	51,877

A summary of our phantom stock and RSU activity during the six months ended June 30, 2012 is presented in the following table:

	Phantom Plan						RSU Plan
	Weighted average grant date fair value		Phantom shares		Vest date fair value		Weighted average grant date fair value		Restricted Stock Units
	($ per share)						($ per share)
Unvested and outstanding at January 1, 2012	$	16.37	125,768				$	—	—
Granted	$	—	—				$	17.84	151,170
Vested	$	14.35	(23,188	)	$	384	$	—	—
Forfeited	$	17.32	(9,709	)			$	17.84	(10,160	)
Unvested and outstanding at June 30, 2012	$	16.78	92,871				$	17.84	141,010

Stock-based compensation cost

We recognized stock-based compensation expense as follows for the periods indicated:

	Three months ended						Six months ended
	June 30,						June 30,
	2012			2011			2012			2011
Stock-based compensation cost	$	1,244		$	1,362		$	3,048		$	3,037
Less: stock-based compensation cost capitalized	(457		)	(555		)	(1,110		)	(1,164		)
Stock-based compensation expense	$	787		$	807		$	1,938		$	1,873