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Common Shares Common Shares (Tables) | 9 Months Ended
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Sep. 30, 2017
Common Shares [Abstract] |
Activity Under At the Market Share Offering Program [Table Text Block] | The following table presents activity under our 2017 ATM program for the three and nine months ended September 30, 2017.
| Three and Nine Months Ended
| September 30,
(in thousands, except per share amounts) | 2017
Total net consideration | $ | 2,513.6 |
Common shares sold | 28.1 |
Average price per share | $ | 90.44 |

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- Definition Common Shares [Abstract] + References No definition available. + Details
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