Equity Awards (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

Information related to stock options at December 31, 2012 is as follows:

	Number of Stock Options		Weighted Average Option Price		Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2012	1,271,149		$	13.29
Exercised	(577,676	)	10.47
Cancelled	(2,500	)	23.00
Expired	(15,308	)	20.00
Outstanding at December 31, 2012	675,665		$	15.52	4.0	$	8,439,234

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Information related to restricted shares at December 31, 2012 is as follows:

	Number of Unvested Restricted Shares		Weighted Average Grant Date Fair Value		Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2012	332,043		$	16.25
Granted	477,210		24.32
Vested	(159,360	)	16.71
Cancelled	(13,856	)	23.91
Outstanding at December 31, 2012	636,037		$	22.02	1.6	$	17,813,994