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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Weighted-average grant-date fair values of stock options and the assumptions used in estimating the fair values are as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted-average grant-date fair value per share | $ | 20.10 |  |  | $ | 10.36 |  |  | $ | 19.04 |
Expected term (years) | 5.4 |  |  | 5.2 |  |  | 5.6 |
Risk-free interest rate | 2.00 | % |  | 1.66 | % |  | 1.70 | %
Expected volatility | 60.31 | % |  | 61.40 | % |  | 61.54 | %
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | The following table summarizes our stock option activity:
| December 31, 2017
| Number of Shares |  | Weighted-average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted- average Remaining Contractual Term
Outstanding at beginning of year | 1.11 |  |  | $ | 31.13 |  |  |  |  |
Granted | 0.32 |  |  | 37.06 |  |  |  |  |
Exercised | (0.08 | ) |  | 25.71 |  |  |  |  |
Forfeited / Cancelled | (0.10 | ) |  | 36.16 |  |  |  |  |
Outstanding at end of year | 1.25 |  |  | $ | 32.58 |  |  | $ | 21.9 |  |  | 6.4 years
Vested and expected to vest at end of year | 1.24 |  |  | $ | 32.60 |  |  | $ | 9.4 |  |  | 6.4 years
Exercisable at end of year | 0.56 |  |  | $ | 36.29 |  |  | $ | 21.7 |  |  | 4.7 years
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following table summarizes our unvested restricted stock and RSUs activity:
| December 31, 2017
| Number of Shares |  | Weighted-Average Grant-Date Fair Value
Unvested at beginning of year | 0.33 |  |  | $ | 24.06 |
Granted | 0.16 |  |  | 37.13 |
Forfeited | (0.03 | ) |  | 26.51 |
Vested | (0.13 | ) |  | 28.52 |
Unvested at end of year | 0.33 |  |  | $ | 28.38 |
Performance units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Activity [Table Text Block] | The following table, which is stated at a 100% earned percentage, summarizes our performance units activity:
| December 31, 2017
| Number of Shares |  | Weighted-Average Grant-Date Fair Value
Unvested at beginning of year | 0.08 |  |  | $ | 31.84 |
Granted | 0.03 |  |  | 38.00 |
Forfeited / Cancelled | (0.01 | ) |  | 31.14 |
Vested | (0.02 | ) |  | 93.34 |
Unvested at end of year | 0.08 |  |  | $ | 24.81 |
Leveraged Restricted Share Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Activity [Table Text Block] | The following table, which is stated at a 100% earned percentage, summarizes our leveraged restricted share unit awards activity:
| December 31, 2017
| Number of Shares |  | Weighted-average Grant-Date Fair Value
Unvested at beginning of year | 0.010 |  |  | $ | 106.90 |
Forfeited / Cancelled | (0.005 | ) |  | 106.90 |
Vested | (0.005 | ) |  | 106.90 |
Unvested at end of year | — |  |  | $ | — |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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