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Stock Based Compensation Non Cash Stock Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The non-cash stock-based compensation expense for the years ended December 31 is as follows:
(in thousands) |  | 2017 |  | 2016 |  | 2015
Stock Incentive Plan |  | $ | 24,899 |  |  | $ | 11,049 |  |  | $ | 11,111 |
Employee Stock Purchase Plan |  | 4,025 |  |  | 3,698 |  |  | 3,430 |
Performance Stock Plan |  | 1,707 |  |  | 1,305 |  |  | 972 |
Incentive Stock Option Plan |  | — |  |  | — |  |  | — |
Total |  | $ | 30,631 |  |  | $ | 16,052 |  |  | $ | 15,513 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation | $ 30,631 | $ 16,052 | $ 15,513
Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation | 24,899 | 11,049 | 11,111
PerformanceStock​Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation | 1,707 | 1,305 | 972
Incentive Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation | 0 | 0 | 0
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation | $ 4,025 | $ 3,698 | $ 3,430

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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=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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