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Defined Contribution, Bonus, and Profit Sharing (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Contribution, Bonus, and Profit Sharing [Abstract] |
Schedule of Costs of Retirement Plans [Table Text Block] | The expense for our defined contribution plans was as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Defined contribution plans expense | $ | 11,709 |  |  | $ | 7,941 |  |  | $ | 6,579 |
Schedule of Bonus and Profit Sharing Expenses [Table Text Block] | Bonus and profit sharing plans and award expense was as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Bonus and profit sharing plans and award expense | $ | 40,005 |  |  | $ | 43,377 |  |  | $ | 14,192 |

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- Definition Defined Contribution, Bonus, and Profit Sharing [Abstract] + References No definition available. + Details
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- Definition Schedule of Bonus and Profit Sharing Plans and Award Expense [Table Text Block] [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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