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Segment Reporting - Summary of Assets by Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
Consolidated assets | $ 19,110,252 | $ 18,974,536
Equity method and other investments | 224,611 | 245,534
Property and equipment, net | 3,393,669 | 3,149,213
U.S. dialysis and related lab services |  |
ASSETS |  |
Consolidated assets | 12,333,641 | 11,802,131
Equity method and other investments | 95,290 | 84,866
Other ancillary services and strategic initiatives |  |
ASSETS |  |
Consolidated assets | 1,387,046 | 1,410,763
Equity method and other investments | 129,321 | 160,668
DMG - Held for sale |  |
ASSETS |  |
Consolidated assets | 5,389,565 | 5,761,642
Equity method and other investments | 4,833 | 10,321
Non-US | Other ancillary services and strategic initiatives |  |
ASSETS |  |
Property and equipment, net | $ 136,052 | $ 125,932

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