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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] |
Summary of Stock Option Activity | A summary of the Company’s stock option activity as of December 31, 2017, and changes during the year then ended, is presented below:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016 | 103,546 |  |  | $ | 15.24 |  |  |  |  |
Exercised | (37,780 | ) |  | 13.46 |  |  |  |  |
Outstanding at December 31, 2017 | 65,766 |  |  | $ | 16.27 |  |  | 2.5 |  | $ | 1,699 |
Exercisable at December 31, 2017 | 65,766 |  |  | $ | 16.27 |  |  | 2.5 |  | $ | 1,699 |
A summary of the Company’s performance stock option activity as of December 31, 2017, and changes during the year then ended, is presented below:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016 | — |  |  | $ | — |  |  |  |  |
Awarded | 340,996 |  |  | 31.32 |  |  |  |  |
Cancelled/forfeited | (74,474 | ) |  | 30.95 |  |  |  |  |
Outstanding at December 31, 2017 | 266,522 |  |  | $ | 31.43 |  |  | 6.0 |  |  | $ | 2,845 |
Vested or Expected to Vest at December 31, 2017 | 244,865 |  |  | $ | 31.47 |  |  | 6.0 |  |  | $ | 2,603 |
Exercisable at December 31, 2017 | — |  |  | $ | — |  |  | — |  |  | $ | — |
Summary of Valuation Assumptions |
Expected volatility | 39.61- 40.30% |
Risk free interest rate | 1.98- 2.43% |
Dividend yield | 0.00 | %
Expected term (in years) | 4.14- 5.01 |
Summary of Restricted Stock Units | A summary of the status of the Company’s stock awards as of December 31, 2017, and changes during the year then ended, is presented below:
| Non-Vested Shares (1) |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2016 | 1,006,471 |  |  | $ | 31.69 |
Awarded | 374,569 |  |  | $ | 33.09 |
Vested | (236,820 | ) |  | $ | 36.43 |
Cancelled/forfeited | (338,463 | ) |  | $ | 31.61 |
Non-vested at December 31, 2017 | 805,757 |  |  | $ | 30.98 |
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(1) | Certain of the Company’s stock awards have a vesting matrix under which the stock awards can vest at a maximum level that is 200% of the shares that would vest for achieving the performance goals at target. The number of shares presented is based on achieving the performance goals at target levels as defined in the stock award agreements. As of December 31, 2017 and 2016, the maximum number of non-vested performance shares that could vest under the provisions of the agreements was 1,038,272 and 1,340,375, respectively.

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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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