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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Share-based Compensation [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the status of stock options granted is presented below:
|  |  |  |  |  | Weighted |  |
|  |  |  |  |  | Average |  |
|  |  |  | Weighted |  | Remaining |  | Aggregate
|  |  |  | Average |  | Contractual |  | Intrinsic
|  |  |  | Exercise |  | Term (in |  | Value (in
|  | Shares |  | Price |  | years) |  | thousands)
Balance at December 31, 2015 |  | 3,621,002 |  |  | $43.15 |  |  |  |
Granted |  | 3,369,197 |  |  | $4.22 |  |  |  |
Exercised |  | — |  |  | — |  |  |  |
Forfeited |  | (781,386 | ) |  | $36.32 |  |  |  |
Balance at December 31, 2016 |  | 6,208,813 |  |  | $22.88 |  | 6.02 |  |  | $ | — |
Vested |  | 2,990,263 |  |  | $43.12 |  | 2.57 |  |  | $ | — |
Exercisable at December 31, 2016 |  | 2,990,263 |  |  | $43.12 |  | 2.57 |  |  | $ | — |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2015 |  | 1,303,573 |  |  | $32.60
Granted |  | 27,379 |  |  | $17.99
Vested |  | (579,246 | ) |  | $32.97
Forfeited |  | (88,703 | ) |  | $30.42
Nonvested at December 31, 2016 |  | 663,003 |  |  | $31.97
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | he following table represents the nonvested performance share units and their corresponding fair value (based upon the closing share price) on the date of grant:
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2015 |  | 491,493 |  |  | $27.83
Granted |  | 950,404 |  |  | $25.55
Vested |  | — |  |  | —
Forfeited |  | (17,346 | ) |  | $19.62
Nonvested at December 31, 2016 |  | 1,424,551 |  |  | $26.41

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -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 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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