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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | Following is a summary of stock option activity for the year ended December 31, 2015, relating to the stock options awarded under the 2009 LTIP and the 1993 Plan:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value(a) (In thousands)
Options outstanding at December 31, 2014 | 2,016,368 |  |  | $ | 24.47 |  |  | 5.71 |  | $ | 7,470 |
Granted | 386,500 |  |  | 21.28 |  |  |  |  |
Exercised | (72,640 | ) |  | 14.24 |  |  |  |  |
Forfeited | (221,600 | ) |  | 43.78 |  |  |  |  |
Options outstanding at December 31, 2015 | 2,108,628 |  |  | $ | 22.21 |  |  | 5.83 |  | $ | 6,300 |
Options vested or expected to vest at December 31, 2015 | 2,084,208 |  |  | $ | 22.07 |  |  | 5.72 |  | $ | 6,544 |
Options exercisable at December 31, 2015 | 1,453,728 |  |  | $ | 22.19 |  |  | 4.65 |  | $ | 5,884 |
(a)Intrinsic value is defined as the amount by which the fair value of the underlying common shares exceeds the exercise price of the option.
Five Year Service Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of our five-year service-based stock options granted during the years ended December 31, 2015, 2014 and 2013 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Risk-free interest rate | 1.72 | % |  | 1.75 | % |  | 0.88 | %
Expected volatility | 56.37 | % |  | 57.99 | % |  | 56.70 | %
Expected term (in years) | 5.6 |  |  | 5.6 |  |  | 5.5 |
Weighted average grant date fair value of options granted during the period | $ | 11.07 |  |  | $ | 12.64 |  |  | $ | 11.97 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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