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Compensation Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The table below summarizes the stock option activity for the year ended December 31, 2014:
|  | Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands) (1)
Outstanding at December 31, 2013 |  | 3,355,054 |  |  | $ | 1.11 |  |  | 6.04 |  | $ | 35,742 |
Exercised |  | (1,029,471 | ) |  | $ | 1.09 |  |  |  |  |
Forfeited |  | (62,589 | ) |  | $ | 2.41 |  |  |  |  |
Outstanding at December 31, 2014 |  | 2,262,994 |  |  | $ | 1.09 |  |  | 5.03 |  | $ | 16,226 |
Exercisable at December 31, 2014 |  | 2,262,994 |  |  | $ | 1.09 |  |  | 5.03 |  | $ | 16,226 |
(1) | The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of December 31, 2014 and 2013, respectively.

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units 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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