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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Stock-Based Compensation | NOTE 11—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 June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Stock options |  | $ | 1,602 |  |  | $ | 1,222 |  |  | $ | 3,091 |  |  | $ | 2,294 |
Restricted stock units |  | 2,964 |  |  | 2,264 |  |  | 5,690 |  |  | 4,305 |
Total |  | $ | 4,566 |  |  | $ | 3,486 |  |  | $ | 8,781 |  |  | $ | 6,599 |
Stock Options During the six months ended June 30, 2019, the Company granted a total of 388,517 stock options at a weighted average grant date fair value of $22.58. At June 30, 2019, unrecognized costs related to outstanding stock options totaled $13.1 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 June 30, 2019 are expected to be recognized over a weighted average period of 2.63 years. Restricted Stock Units During the six months ended June 30, 2019, the Company granted 167,736 restricted stock units at an estimated average grant date fair value of $95.47. At June 30, 2019, unrecognized costs related to outstanding restricted stock units totaled $24.7 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 June 30, 2019 are expected to be recognized over a weighted average period of 2.54 years.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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