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Acquisitions (Summary of Acquisitions) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |
Cash paid, net of cash acquired | $ 374,664 | $ 88,075
2018 Acquisitions |  |
Business Acquisition [Line Items] |  |
Cash paid, net of cash acquired | 374,664 |
Debt issued | 125,055 |
Total consideration | $ 499,719 |

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