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Summary of Significant Accounting Policies Equity Incentive Awards (Tables) | 3 Months Ended
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Mar. 31, 2017
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Expected Volatility |  | Risk-free Interest Rate |  | Expected Term |  | Dividend Rate
March 31, 2017: |  |  |  |  |  |  |  |
Employees |  | 62 | % |  | 1.7 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 71 | % |  | 2.3 | % |  | 8 |  | — | %
March 31, 2016: |  |  |  |  |  |  |  |
Employees |  | 63 | % |  | 1.1 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 83 | % |  | 1.6 | % |  | 8 |  | — | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Options |  | Weighted Average Exercise Price
|  | (in thousands) |  |
Outstanding at December 31, 2016 |  | 4,834 |  |  | $ | 11.24 |
Granted |  | 709 |  |  | 14.43 |
Exercised |  | (96 | ) |  | 11.53 |
Expired |  | (120 | ) |  | 27.58 |
Forfeited |  | (3 | ) |  | 15.80 |
Outstanding at March 31, 2017 |  | 5,324 |  |  | 11.29 |
Exercisable at March 31, 2017 |  | 2,875 |  |  | $ | 11.48 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Outstanding at December 31, 2016 |  | 875 |  |  | $ | 8.13 |
Granted |  | 418 |  |  | 14.44 |
Vested |  | (286 | ) |  | 8.78 |
Forfeited |  | (4 | ) |  | 10.37 |
Outstanding at March 31, 2017 |  | 1,003 |  |  | $ | 10.56 |

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- Definition Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Abstract] + References No definition available. + 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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- 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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