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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table sets forth the weighted average fair value of stock options and the assumptions used to estimate the fair value of the stock options using the Black-Scholes option valuation model:
| 2017 |  | 2016 |  | 2015
Weighted average fair value of stock options granted | $ | 3.91 |  |  | $ | 1.06 |  |  | $ | 2.65 |
Volatility | 67.07 | % |  | 61.75 | % |  | 55.71 | %
Expected life in years | 4.00 |  |  | 3.99 |  |  | 4.75 |
Risk-free interest rate | 1.69 | % |  | 1.50 | % |  | 1.51 | %
Dividend yield | — |  |  | — |  |  | — |
Schedule of Stock-based Compensation, Stock Options and Stock Appreciation Rights Award Activity | The following table summarizes stock option and SAR activity for the years ended December 31, 2017, 2016, and 2015:
| Stock Options |  | SARs
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2014 | 598,346 |  |  | $ | 16.26 |  |  | 46,572 |  |  | $ | 14.06 |
Granted | 310,028 |  |  | 5.57 |  |  | — |  |  | — |
Canceled/forfeited | (238,365 | ) |  | 12.69 |  |  | — |  |  | — |
Outstanding at December 31, 2015 | 670,009 |  |  | 12.58 |  |  | 46,572 |  |  | 14.06 |
Granted | 183,251 |  |  | 2.19 |  |  | — |  |  | — |
Exercised | (170,897 | ) |  | 7.81 |  |  | — |  |  | — |
Canceled/forfeited | (25,752 | ) |  | 16.76 |  |  | (4,420 | ) |  | 13.31 |
Outstanding at December 31, 2016 | 656,611 |  |  | 10.76 |  |  | 42,152 |  |  | 14.14 |
Granted | 14,820 |  |  | 7.60 |  |  | — |  |  | — |
Exercised | (26,966 | ) |  | 3.28 |  |  | — |  |  | — |
Canceled/forfeited | (27,019 | ) |  | 21.88 |  |  | — |  |  | — |
Outstanding at December 31, 2017 | 617,446 |  |  | $ | 10.53 |  |  | 42,152 |  |  | $ | 14.14 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes outstanding stock options as of December 31, 2017.
Range of Exercise Price | Number Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
$ 0.00-$10.00 | 434,520 |  |  | $ | 5.45 |  |  | 7.24 |  |
$10.00-$20.00 | 47,051 |  |  | 12.73 |  |  | 5.68 |  |
$20.00-$30.00 | 133,692 |  |  | 25.64 |  |  | 4.33 |  |
$30.00-$40.00 | — |  |  | — |  |  | 0.00 |  |
$40.00-$50.00 | 2,183 |  |  | 48.50 |  |  | 0.03 |  |
Outstanding | 617,446 |  |  | $ | 10.53 |  |  | 6.47 |  | $ | 1,127 |
Vested and expected to vest | 601,545 |  |  | $ | 10.71 |  |  | 6.42 |  | $ | 1,065 |
Exercisable | 427,730 |  |  | $ | 13.62 |  |  | 5.81 |  | $ | 377 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock activity for the years ended December 31, 2017, 2016, and 2015:
| Restricted Stock
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014 | 901,999 |  |  | $ | 12.19 |
Granted | 1,180,384 |  |  | 5.49 |
Vested | (317,122 | ) |  | 13.38 |
Cancelled/Forfeited | (257,849 | ) |  | 7.59 |
Outstanding at December 31, 2015 | 1,507,412 |  |  | 7.49 |
Granted | 1,768,746 |  |  | 3.72 |
Vested | (681,829 | ) |  | 8.51 |
Cancelled/Forfeited | (160,414 | ) |  | 7.16 |
Outstanding at December 31, 2016 | 2,433,915 |  |  | 4.48 |
Granted | 799,165 |  |  | 8.78 |
Vested | (1,023,708 | ) |  | 5.14 |
Cancelled/Forfeited | (53,527 | ) |  | 5.90 |
Outstanding at December 31, 2017 | 2,155,845 |  |  | $ | 5.72 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] | The following table summarizes performance shares activity for the years ended December 31, 2017, 2016, and 2015:
| Performance Shares
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014 | 516,830 |  |  | $ | 17.61 |
Granted | 809,293 |  |  | 6.97 |
Cancelled/Forfeited | (190,988 | ) |  | 15.62 |
Outstanding at December 31, 2015 | 1,135,135 |  |  | 10.35 |
Granted | 1,437,077 |  |  | 1.79 |
Cancelled/Forfeited | (199,580 | ) |  | 17.98 |
Outstanding at December 31, 2016 | 2,372,632 |  |  | 4.53 |
Granted | 316,213 |  |  | 11.58 |
Vested | (66,696 | ) |  | 14.18 |
Cancelled/Forfeited | (253,868 | ) |  | 11.56 |
Outstanding at December 31, 2017 | 2,368,281 |  |  | $ | 4.44 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights 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=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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