Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Share-based Compensation [Abstract]

Rollforward of unvested stock-based compensation awards

A summary of our restricted stock activity during the nine months ended September 30, 2012 is presented below: 

	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	$	607.06	525				$	394.00	5,532
Vested	$	681.40	(2,583	)	$	1,930	$	—	—
Forfeited	$	685.04	(601	)			$	299.56	(2,364	)
Unvested and total outstanding at September 30, 2012	$	675.92	8,926				$	307.52	56,266

A summary of our phantom stock and RSU activity during the nine months ended September 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	$	—	—				$	17.07	177,026
Vested	$	14.34	(26,254	)	$	401	$	—	—
Forfeited	$	17.06	(13,324	)			$	17.34	(20,907	)
Unvested and outstanding at September 30, 2012	$	16.89	86,190				$	17.03	156,119

Stock-based compensation cost

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

	Three months ended						Nine months ended
	September 30,						September 30,
	2012			2011			2012			2011
Stock-based compensation cost	$	1,725		$	1,179		$	4,773		$	4,216
Less: stock-based compensation cost capitalized	(605		)	(439		)	(1,715		)	(1,603		)
Stock-based compensation expense	$	1,120		$	740		$	3,058		$	2,613