Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table sets out the weighted average assumptions used to estimate the fair value of the options and SSARs granted using the Black-Scholes option-pricing model in the first three months of the respective years noted:

	2013	2012
Expected stock price volatility	69.2%	63.3%
Expected dividend yield	—%	—%
Risk-free interest rate	0.9%	0.7%
Expected life of options	5 years	5 years
Weighted average fair value of options and SSARs granted	$11.68	$4.68

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes stock options and SSARs outstanding as of March 31, 2013, as well as activity during the three month period then ended.

Share amounts in thousands	Options and SSARs		Weighted Average Exercise Price		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Options / SSARs outstanding at January 1, 2013	8,475		$	12.88
SSARs granted	343		20.49
Options / SSARs exercised	(1,805	)	9.13
Options /SSARs canceled	—		—
Options/SSARs outstanding at March 31, 2013	7,013		$	14.22	5.7	$	57.4
Vested and expected to vest at March 31, 2013	6,663		—		—	$	54.6
Options/SSARS exercisable at March 31, 2013	5,719		$	14.70	—	$	45.2

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes incentive share awards outstanding as of March 31, 2013 as well as activity during the three months then ended.

	Shares		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Incentive share awards outstanding at January 1, 2013	960,388
Incentive share awards granted	123,286
Incentive share awards vested	(341,607	)
Incentive share awards canceled	(478	)
Incentive shares outstanding at March 31, 2013	741,589		1.6	$	16.0
Vested and expected to vest at March 31, 2013	704,510		—	$	15.2
Incentive share awards exercisable at March 31, 2013	—		—	—

Restricted Stock Activity [Table Text Block]

The following table summarizes the restricted stock outstanding as of March 31, 2013 as well as activity during the three months then ended.

	Number of Shares		Weighted Average Grant Date Fair Value
Restricted stock awards outstanding at January 1, 2013	556,987		$	8.51
Restricted stock awards granted	108,174		20.49
Restrictions lapsed	(205,739	)	7.00
Restricted stock awards at March 31, 2013	459,422		$	12.01