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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 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:
| 2015 |  | 2014 |  | 2013
Expected stock price volatility | 54 | % |  | 57 | % |  | 69 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Risk-free interest rate | 1.5 | % |  | 1.5 | % |  | 0.9 | %
Expected life of options (in years) | 6.0 years |  |  | 5.0 years |  |  | 5.0 years |
Weighted average fair value of options and SSARs granted | $ | 8.80 |  |  | $ | 9.03 |  |  | $ | 11.68 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes stock options and SSARs outstanding as of December 31, 2015 as well as activity during the three year period then ended.
Share amounts in thousands | Options/ 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 |  |  |  |  |
Options granted | 343 |  |  | $ | 20.49 |  |  |  |  |
Options / SSARS exercised | (1,861 | ) |  | $ | 9.06 |  |  |  |  |
Options / SSARS canceled | (20 | ) |  | $ | 22.23 |  |  |  |  |
Options / SSARS outstanding at December 31, 2013 | 6,937 |  |  | $ | 14.26 |  |  |  |  |
Options granted | 494 |  |  | $ | 18.09 |  |  |  |  |
Options / SSARS exercised | (43 | ) |  | $ | 9.92 |  |  |  |  |
Options / SSARS canceled | (384 | ) |  | $ | 21.14 |  |  |  |  |
Options / SSARS outstanding at December 31, 2014 | 7,004 |  |  | $ | 14.19 |  |  |  |  |
Options granted | 378 |  |  | $ | 17.04 |  |  |  |  |
Options / SSARS exercised | (1,334 | ) |  | $ | 10.76 |  |  |  |  |
Options / SSARS canceled | (309 | ) |  | $ | 25.83 |  |  |  |  |
Options / SSARS outstanding at December 31, 2015 | 5,739 |  |  | $ | 14.54 |  |  | 4.2 |  | $ | 29.8 |
Vested and expected to vest at December 31, 2015(1) | 5,714 |  |  | $ | 14.54 |  |  | 4.2 |  | $ | 29.8 |
Options / SSARS exercisable at December 31, 2015 | 4,987 |  |  | $ | 14.04 |  |  | 3.6 |  | $ | 29.5 |
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(1) | Options or SSARS expected to vest based upon historical forfeiture rate
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 December 31, 2015 as well as activity during the three-year period 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 shares awards granted | 166,474 |  |  |  |  |
Incentive share awards vested | (350,107 | ) |  |  |  |
Incentive share awards canceled | (24,160 | ) |  |  |  |
Incentive share awards outstanding at December 31, 2013 | 752,595 |  |  |  |  |
Incentive shares awards granted | 123,982 |  |  |  |  |
Incentive share awards vested | (253,834 | ) |  |  |  |
Incentive share awards canceled | (29,130 | ) |  |  |  |
Incentive share awards outstanding at December 31, 2014 | 593,613 |  |  |  |  |
Incentive shares awards granted | 252,629 |  |  |  |  |
Incentive share awards vested | (285,495 | ) |  |  |  |
Incentive share awards canceled | (24,765 | ) |  |  |  |
Incentive share awards outstanding at December 31, 2015 | 535,982 |  |  | 1.3 |  |  | $ | 9.7 |
Vested and expected to vest at December 31, 2015(1) | 503,552 |  |  | 1.3 |  |  | $ | 9.1 |
Incentive share awards exercisable at December 31, 2015 | — |  |  | — |  |  | — |
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(1) | Incentive shares expected to vest based upon historical forfeitures rate
Restricted Stock Activity [Table Text Block] | The following table summarizes restricted stock awards outstanding as of December 31, 2015 as well as activity during the three year period then ended.
| Number of Shares |  | Weighted Average Grant Date Fair Value
Restricted stock awards outstanding at January 1, 2013 | 625,049 |  |  | $ | 8.46 |
Restricted stock awards granted | 108,174 |  |  | 20.49 |
Restrictions lapsing | (221,138 | ) |  | 7.37 |
Restricted stock awards canceled | — |  |  | — |
Restricted stock awards at December 31, 2013 | 512,085 |  |  | 11.48 |
Restricted stock awards granted | 122,649 |  |  | 17.93 |
Restrictions lapsing | (170,567 | ) |  | 9.54 |
Restricted stock awards canceled | (11,021 | ) |  | 12.35 |
Restricted stock awards at December 31, 2014 | 453,146 |  |  | 13.93 |
Restricted stock awards granted | 69,744 |  |  | 17.04 |
Restrictions lapsing | (225,645 | ) |  | 8.71 |
Restricted stock awards canceled | (14,544 | ) |  | 19.29 |
Restricted stock awards at December 31, 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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