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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2019
Share-based Compensation [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION The Company's stock incentive plan allows for grants of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units and other stock-based or cash-based awards. See Note 16 in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 for additional information concerning its stock-based compensation. Stock-based compensation expense consisted of the following:
|  | Three Months Ended March 31,
(in thousands) |  | 2019 |  | 2018
Stock options |  | $ | 1,489 |  |  | $ | 1,072 |
Restricted stock units |  | 2,726 |  |  | 2,041 |
Total |  | $ | 4,215 |  |  | $ | 3,113 |
Stock Options During the three months ended March 31, 2019, the Company granted a total of 365,489 stock options at a weighted average grant date fair value of $22.26. At March 31, 2019, unrecognized costs related to outstanding stock options totaled $14.2 million, before any related tax benefit. The unrecognized costs related to stock options are amortized over the related vesting period using the straight-line attribution method. Unrecognized costs related to stock options at March 31, 2019 are expected to be recognized over a weighted average period of 2.82 years. Restricted Stock Units During the three months ended March 31, 2019, the Company granted 160,500 restricted stock units at an estimated average grant date fair value of $95.58. At March 31, 2019, unrecognized costs related to outstanding restricted stock units totaled approximately $27.2 million, before any related tax benefit. The unrecognized costs related to restricted stock units are being amortized over the related vesting period using the straight-line attribution method. These unrecognized costs at March 31, 2019 are expected to be recognized over a weighted average period of 2.74 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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