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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Stock Incentive Plan For the three quarters ended September 30, 2017, the Company granted 872,285 stock options to selected employees that vest 100% on the third anniversar y of the grant date and expire on the tenth a nniversary of the grant date. The weighted-average grant-date fair value of the stock options was $4.22. The following table summarizes the weighted-average assumptions used in the Black-Scholes option-pricing model to determine the fair value of the stock options granted:
Grant-date stock price |  | $ | 9.41
Exercise price |  | $ | 9.41
Dividend yield |  |  | 0%
Expected volatility(1) |  |  | 42.3%
Risk-free interest rate(2) |  |  | 2.0%
Expected life of options (in years)(3) |  |  | 6.5
(1) Determined based on the historical volatility of the Common Shares over the expected life of the stock options. (2) Determined based on U.S. Treasury yields with a remaining term equal to the expected life of the stock options. (3) Determined based on the mid-point of vesting (three years) and expiration (ten years). The fair value of the PSUs was estimated using a Monte Carlo valuation model, which simulates the potential outcomes for the Company’s stock price performance and determines the payouts that would occur under each scenario. Fair value is based on the average of those results. The grant-date weighted-average fair value of the PSUs was determined to be $5.85, based on the following inputs to the valuation model:
Grant-date stock price |  |  | $ | 9.47
Dividend yield |  |  |  | 0%
Expected volatility(1) |  |  |  | 42.3%
Risk-free interest rate(2) |  |  |  | 1.5%
Expected life (in years)(3) |  |  |  | 3.0
(1) Determined based on the historical volatility of the Common Shares over 6.5 years, which is consistent with the volatility assumption for stock options granted to employees on the same date as the PSUs. (2) Determined based on U.S. Treasury yields with a remaining term equal to the expected li fe of the PSUs. (3) Determined based on vesting for the PSUs. The grant-date weighted-average fair values of the Special Stock Options and Special Performance Units were esti mated using a Monte Carlo valuation model and determined to be $1.84 and $2.79, respectively, based on the following i nputs to the valuatio n model:
|  |  |  |  |  |  | Special
|  |  |  |  | Special Stock |  | Performance
|  |  |  |  | Options |  | Units
Grant-date stock price | $ | 7.00 | $ | 7.00
Exercise price | $ | 7.00 |  | NA
Dividend yield |  | 0% |  | 0%
Expected volatility(1) |  | 42.0% |  | 42.0%
Risk-free interest rate(2) |  | 2.2% |  | 1.5%
Expected life (in years)(3) |  | 6.5 |  | 3.0
(1) Determined based on the historical volatility of the Common Shares over the expected life of the Special Stock Options. (2) Determined based on U.S. Treasury yields with a remaining term equal to the respective expected lives of the Special Stock Options and Special Performance Units. (3) Determined using the simplified method for the Special Stock Options, based on the mid-point of vesting (three years) and expiration (ten years). Determined based on vesting for the Special Performance Units.

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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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