Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Share-Based Compensation.

Schedule of restricted stock units activity

	Three Month Periods Ended March 31,
	2014					2013
	RSUsOutstanding		Unamortized Grant Date Fair Value			RSUs Outstanding		Unamortized  Grant Date Fair Value
Beginning of period	1,448,374		$	12.2		1,327,041		$	10.3
Fixed RSUs Awarded	20,000		0.5			—		—
Variable RSUs projected to be awarded for the 2014-2017 cycle	494,340		13.5			—		—
Variable RSUs projected to be awarded for the 2013-2016 cycle	—		—			498,954		10.7
Change in Variable RSUs projected for the 2013-2016 cycle	(17,263	)	(0.3		)	—
RSU payments	(300,400	)	—			(329,653	)	—
RSU forfeitures	(55,541	)	(1.0		)	(10,037	)	—
RSU expense recognized	—		(3.0		)	—		(3.3		)
End of period	1,589,510		$	21.9		1,486,305		$	17.7

Schedule of restricted stock units outstanding and the unamortized grant date fair value for each award cycle

Award Date and Cycle	RSUs Outstanding	Unamortized Grant Date Fair Value
Four-year RSU awards granted in 2010	1,250	$	—
Three-year RSU awards granted in 2011	10,000	—
Five-year RSU awards granted in 2011	14,000	0.1
Three-year RSU awards granted in 2012	4,000	—
Four-year RSU awards granted in 2012	444,212	2.6
Five-year RSU awards granted in 2012	6,800	0.1
One-year RSU awards granted in 2013	16,000	0.1
Three-year RSU awards granted in 2013	12,000	0.2
Four-year RSU awards granted in 2013	566,908	6.6
One-year RSU awards granted in 2014	5,000	0.1
Three-year RSU awards granted in 2014	11,000	0.3
Four-year RSU awards granted in 2014 (those awards in their Initial Award Period)	494,340	11.7
Five-year RSU awards granted in 2014	4,000	0.1
Total RSUs outstanding at March 31, 2014	1,589,510	$	21.9