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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of the Company's Stock Option Activity | A summary of the Company’s stock option activity is as follows:
|  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |
Options outstanding as of January 1, 2017 |  |  | 966,060 |  |  | $ | 17.78 |  |  |  |  |
Granted |  |  | 273,800 |  |  |  | 25.68 |  |  |  |  |
Exercised |  |  | (258,699 | ) |  |  | 19.86 |  |  |  |  |
Forfeited |  |  | (80,727 | ) |  |  | 20.45 |  |  |  |  |
Cancelled |  |  | (24,287 | ) |  |  | 26.98 |  |  |  |  |
Options outstanding as of December 31, 2017 |  |  | 876,147 |  |  |  | 19.13 |  |  |  |  |
Granted |  |  | 187,484 |  |  |  | 32.31 |  |  |  |  |
Exercised |  |  | (96,125 | ) |  |  | 19.81 |  |  |  |  |
Forfeited |  |  | (5,215 | ) |  |  | 25.44 |  |  |  |  |
Cancelled |  |  | (5,931 | ) |  |  | 24.36 |  |  |  |  |
Options outstanding as of December 31, 2018 |  |  | 956,360 |  |  | $ | 21.57 |  |  | $ | 0.6 |
Options exercisable as of: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  |  | 511,899 |  |  | $ | 17.98 |  |  | $ | 0.6 |
Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant | The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing method with the following assumptions:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Expected Life (years) |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 6.5 |
Risk-free Interest rate |  |  | 2.8 | % |  |  | 2.2 | % |  |  | 1.6 | %
Expected volatility |  |  | 43.7 | % |  |  | 45.0 | % |  |  | 45.0 | %
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity | A summary of activity for restricted stock awards for the years ended December 31, 2018 and 2017 are as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of January 1, 2017 |  |  | 39,028 |  |  | $ | 86.92 |
Granted |  |  | — |  |  |  | — |
Vested |  |  | (11,058 | ) |  |  | 86.92 |
Forfeited |  |  | (5,546 | ) |  |  | 86.92 |
Unvested as of December 31, 2017 |  |  | 22,424 |  |  |  | 86.92 |
Granted |  |  | — |  |  |  | — |
Vested |  |  | (22,424 | ) |  |  | 86.92 |
Forfeited |  |  | — |  |  |  | — |
Unvested as of December 31, 2018 |  |  | — |  |  | $ | — |
Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity | A summary of activity for restricted stock units for the years ended December 31, 2018 and 2017 are as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of January 1, 2017 |  |  | 241,108 |  |  | $ | 49.03 |
Granted |  |  | 152,855 |  |  |  | 26.05 |
Vested |  |  | (45,755 | ) |  |  | 93.55 |
Forfeited |  |  | (28,208 | ) |  |  | 35.61 |
Unvested as of December 31, 2017 |  |  | 320,000 |  |  |  | 32.71 |
Granted |  |  | 111,713 |  |  |  | 28.49 |
Vested |  |  | (203,355 | ) |  |  | 38.81 |
Forfeited |  |  | (8,869 | ) |  |  | 21.04 |
Unvested as of December 31, 2018 |  |  | 219,489 |  |  | $ | 25.37 |
Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity | A summary of activity for performance stock units for the years ended December 31, 2018 and 2017 are as follows:
|  | Shares |  |  | Weighted Average Grant Date Per Share |
Unvested as of January 1, 2017 |  |  | 201,257 |  |  | $ | 28.45 |
Granted |  |  | 115,047 |  |  |  | 30.58 |
Vested |  |  | (17,637 | ) |  |  | 85.03 |
Forfeited |  |  | (29,425 | ) |  |  | 25.59 |
Unvested as of December 31, 2017 |  |  | 269,242 |  |  |  | 25.97 |
Granted |  |  | 93,298 |  |  |  | 33.86 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (3,675 | ) |  |  | 30.31 |
Unvested as of December 31, 2018 |  |  | 358,865 |  |  | $ | 27.98 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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