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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] | Stock-based compensation expense consisted of the following:
|  | Three Months Ended March 31, |  |  |  |  |  |
(in thousands) |  | 2020 |  | 2019 |  |  |  |
Stock options |  | $ | 1,704 |  |  | $ | 1,489 |  |  |  |  |
Restricted stock units |  | 1,971 |  |  | 2,726 |  |  |  |  |
Total |  | $ | 3,675 |  |  | $ | 4,215 |  |  |  |  |
Stock Options During the three months ended March 31, 2020, the Company granted a total of 640,219 stock options at a weighted average grant date fair value of $14.36. As of March 31, 2020, unrecognized costs related to outstanding stock options totaled $16.4 million, before any related tax benefit. As of March 31, 2020, unrecognized costs related to stock options are expected to be recognized over a weighted average period of 3.03 years. Restricted Stock Units During the three months ended March 31, 2020, the Company granted 201,349 restricted stock units at an estimated average grant date fair value of $79.51. As of March 31, 2020, unrecognized costs related to outstanding restricted stock units totaled $27.3 million, before any related tax benefit. As of March 31, 2020, unrecognized costs related to restricted stock units are expected to be recognized over a weighted average period of 2.81 years.

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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