Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Transactions involving stock options under the terms of the LTSIP

Stock-option transactions under the terms of the LTSIP are summarized below:



	Options Outstanding		Price Range					Weighted-average Price
Balance at December 31, 2011	1,773,635		$	3.70	-	$	17.35	$	8.54
Exercised	(149,117	)	3.70		-	13.10		4.71
Balance at March 31, 2012	1,624,518		$	4.37	-	$	17.35	$	8.89



Options Outstanding									Options Exercisable			Unvested Options
Range of exercise prices					Number outstanding at March 31, 2012	Weighted-average remaining term in years	Weighted-average exercise price		Number exercisable at March 31, 2012	Weighted-average exercise price		Number unvested at March 31, 2012	Weighted- average exercise price
$	4.37	-	$	7.84	756,811	1.1	$	4.82	756,811	$	4.82	—	$	—
11.40		-	12.43		539,174	2.7	11.78		539,174	11.78		—	—
13.10		-	17.35		328,533	4.3	13.52		299,135	13.56		29,398	13.10
					1,624,518	2.3	$	8.89	1,595,120	$	8.81	29,398	$	13.10

Transactions involving restricted shares under the terms of the LTSIP

Transactions involving restricted shares under the terms of the LTSIP are summarized below:



	Restricted Shares Outstanding		Price Range					Weighted-average Price
Balance at December 31, 2011	771,550		$	11.40	-	$	17.97	$	16.22
Granted	357,678					19.39		19.39
Distributed	(257,510	)	11.40		-	17.97		16.21
Balance at March 31, 2012	871,718		$	13.10	-	$	19.39	$	17.52

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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