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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of share-based compensation expense | Share-based compensation expense was as follows:
| For the three months ended June 30, |  | For the six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock options, net of estimated forfeitures | $ | 9,550 |  |  | $ | 11,141 |  |  | $ | 28,831 |  |  | $ | 16,296 |
Restricted stock awards | 3,399 |  |  | 2,390 |  |  | 6,506 |  |  | 4,315 |
Total non-cash stock compensation | 12,949 |  |  | 13,531 |  |  | 35,337 |  |  | 20,611 |
Deferred compensation arrangement | — |  |  | 214 |  |  | — |  |  | 298 |
Total | $ | 12,949 |  |  | $ | 13,745 |  |  | $ | 35,337 |  |  | $ | 20,909 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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