Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Share-based Compensation [Abstract]

Transactions involving stock options under the terms of the LTSIP

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

	Options Outstanding		Exercise Price Range					Weighted-Average Exercise Price
Balance at December 31, 2012	770,923		$	4.37	-	$	17.35	$	11.35
Exercised	(50,750	)	4.37			4.37		4.37
Balance at June 30, 2013	720,173		$	7.84	-	$	17.35	$	11.84

Options held under the LTSIP, by exercise price range

Options Outstanding									Options Exercisable
Range of exercise prices					Number outstanding at June 30, 2013	Weighted-average remaining term in years	Weighted-average exercise price		Number exercisable at June 30, 2013	Weighted-average exercise price
$	7.84	-	$	11.40	404,174	2.4	$	10.52	404,174	$	10.52
13.10		-	17.35		315,999	3.0	13.54		315,999	13.54
					720,173	2.7	$	11.84	720,173	$	11.84

Transactions involving restricted shares and RSUs under the terms of the LTSIP

Transactions involving RSUs under the terms of the LTSIP are summarized below:

	RSUs Outstanding		Price Range					Weighted-Average Price
Granted	322,026		$	23.09	-	$	25.44	$	23.63
Vested	(4,234	)	23.62			23.62		23.62
Balance at June 30, 2013	317,792		$	23.09	-	$	25.44	$	23.63

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, 2012	810,342		$	13.10	-	$	20.90	$	17.74
Granted	658		21.53			21.53		21.53
Vested	(338,750	)	13.10		-	19.39		17.54
Balance at June 30, 2013	472,250		$	13.10	-	$	21.53	$	17.89

Transactions involving performance shares under the terms of the LTSIP

Performance share transactions under the terms of the LTSIP are summarized below:

	Target Number of Performance Shares Outstanding	Grant-Date Fair Value Range					Weighted- Average Grant-Date Fair Value
Balance at December 31, 2012	264,867	$	18.23	-	$	25.42	$	21.94
Granted	126,606	39.62			39.62		39.62
Balance at June 30, 2013	391,473	$	18.23	-	$	39.62	$	27.66