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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 Non-vested Restricted Stock Units | Non-vested RSUs outstanding as of December 31, 2017 and the changes during the year were as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2016 | 1,633,478 |  |  | $ | 14.40 |
Granted | 1,368,999 |  |  | 8.83 |
Vested | (995,845 | ) |  | 14.66 |
Forfeited | (141,332 | ) |  | 9.46 |
Non-vested at December 31, 2017 | 1,865,300 |  |  | $ | 10.55 |
Schedule of Weighted Average Assumptions for PRSUs | The weighted average assumptions for the PRSUs granted in 2016 are as follows:
| 2016
Expected term (in years) | 2.86
Expected volatility | 42.7%
Risk-free interest rate | 0.88%
Correlation range | 24.4% to 71.0%
The weighted average assumptions for the PRSUs granted in 2017 are as follows:
| 2017
Expected term (in years) | 2.92
Expected volatility | 42.1%
Risk-free interest rate | 1.51%
Correlation range | 26.8% to 76.0%
Schedule of Non-vested PRSU's Outstanding | Non-vested PRSUs outstanding as of December 31, 2017 and the changes during the year were as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2016 | 199,168 |  |  | $ | 14.21 |
Granted | 293,083 |  |  | 8.74 |
Vested | (26,126 | ) |  | 6.99 |
Forfeited | (81,880 | ) |  | 9.60 |
Non-vested at December 31, 2017 | 384,245 |  |  | $ | 9.01 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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 of number and weighted-average grant date fair value for nonvested performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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