Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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 six months of the respective years noted:

	2014	2013
Expected stock price volatility	57.5%	69.2%
Expected dividend yield	—%	—%
Risk-free interest rate	1.5%	0.9%
Expected life of options (in years)	5 years	5 years
Weighted average fair value of options and SSARs granted	$9.03	$11.68

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity

The following table summarizes stock options and SSARs outstanding as of June 30, 2014, as well as activity during the six 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 outstanding at January 1, 2014	6,937		$	14.26
Options granted	494		18.09
Options exercised	(3	)	15.27
Options canceled	(375	)	21.05
Options outstanding at June 30, 2014	7,053		$	14.17	5.0	$	26.2
Vested and expected to vest at June 30, 2014(1)	6,701		—		—	$	24.8
Options exercisable at June 30, 2014	6,051		$	13.91	—	$	24.2

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

The following table summarizes incentive share awards outstanding as of June 30, 2014 as well as activity during the six months then ended.

	Shares		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Incentive share awards outstanding at January 1, 2014	752,595
Incentive share awards granted	146,095
Incentive share awards vested	(287,912	)
Incentive share awards canceled	(13,456	)
Incentive shares outstanding at June 30, 2014	597,322		1.3	$	9.0
Vested and expected to vest at June 30, 2014(1)	567,456		—	$	8.5

Restricted Stock Activity [Table Text Block]

The following table summarizes the restricted stock outstanding as of June 30, 2014 as well as activity during the six months then ended.

	Number of Shares		Weighted Average Grant Date Fair Value
Restricted stock awards outstanding at January 1, 2014	512,085		$	11.48
Restricted stock awards granted	122,649		17.93
Restrictions lapsed	(160,567	)	9.64
Restricted stock canceled	(11,021	)	12.35
Restricted stock awards at June 30, 2014	463,146		$	13.80