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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and six months ended June 30, 2017 and 2016, respectively, as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock-based compensation expense | $ | 6,259 |  |  | $ | 4,189 |  |  | $ | 12,439 |  |  | $ | 7,978 |
Less: Deferred tax benefit | (2,189 | ) |  | (1,469 | ) |  | (4,342 | ) |  | (2,768 | )
Stock-based compensation expense, net of tax | $ | 4,070 |  |  | $ | 2,720 |  |  | $ | 8,097 |  |  | $ | 5,210 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=96867065&loc=d3e5070-113901 + Details
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