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Subsequent events (Notes)	3 Months Ended
Subsequent events (Notes)	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent events	Subsequent events On May 1, 2017, the Company completed its acquisition of 100% of the interest in Colorado-based Renal Ventures Management, LLC (Renal Ventures) for approximately $360,000 in cash, subject to certain post-closing adjustments. Renal Ventures operates 38 outpatient dialysis centers in six states. As a part of this transaction, the Company was required to divest seven outpatient dialysis centers.