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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
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 SSARs granted using the Black-Scholes option-pricing model in the first six months of the respective years noted.
| 2015 |  | 2014
Expected stock price volatility | 54.4% |  | 57.5%
Expected dividend yield | —% |  | —%
Risk-free interest rate | 1.5% |  | 1.5%
Expected life of options (in years) | 6 years |  | 5 years
Weighted average fair value of options and SSARs granted | $8.80 |  | $9.03
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, 2015, 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 and SSARs outstanding at January 1, 2015 | 7,004 |  |  | $ | 14.19 |  |  |  |  |
Options and SSARs granted | 379 |  |  | 17.04 |  |  |  |  |
Options and SSARs exercised | (1,141 | ) |  | 11.45 |  |  |  |  |
Options and SSARs canceled | (281 | ) |  | 26.41 |  |  |  |  |
Options and SSARs outstanding at June 30, 2015 | 5,961 |  |  | 14.32 |  |  | 4.7 |  |  | $ | 28.3 |
Vested and expected to vest at June 30, 2015(1) | 5,663 |  |  | — |  |  | — |  |  | $ | 26.9 |
Options and SSARs exercisable at June 30, 2015 | 5,185 |  |  | $ | 13.78 |  |  | 4.1 |  |  | $ | 28.3 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table summarizes incentive share awards outstanding as of June 30, 2015 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, 2015 | 593,613 |  |  |  |  |
Incentive share awards granted | 250,129 |  |  |  |  |
Incentive share awards vested | (273,995 | ) |  |  |  |
Incentive share awards canceled | (15,083 | ) |  |  |  |
Incentive shares outstanding at June 30, 2015 | 554,664 |  |  | 1.7 |  |  | $ | 9.5 |
Vested and expected to vest at June 30, 2015(1) | 526,931 |  |  | — |  |  | $ | 9.0 |
Restricted Stock Activity [Table Text Block] | The following table summarizes the restricted stock outstanding as of June 30, 2015 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, 2015 | 453,146 |  |  | $ | 13.93 |
Restricted stock awards granted | 69,744 |  |  | 17.04 |
Restrictions lapsing | (225,645 | ) |  | 8.71 |
Restricted stock canceled | (14,544 | ) |  | 19.29 |
Restricted stock awards at June 30, 2015 | 282,701 |  |  | 18.59 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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