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Acquisitions (Summary of Acquisitions) (Details) - USD ($) $ in Thousands	6 Months Ended
	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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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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