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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS



		Balance at beginning of year				Acquisitions				Amounts charged to income				Amounts written off				Balance at end of year
Description		Balance at beginning of year				Acquisitions				Amounts charged to income				Amounts written off				Balance at end of year
		(in thousands)
Allowance for uncollectible accounts:
Year ended December 31, 2017		$	238,897			$	—			$	478,365			$	498,863			$	218,399
Year ended December 31, 2016		$	251,734			$	—			$	442,985			$	455,822			$	238,897
Year ended December 31, 2015		$	229,802			$	—			$	422,145			$	400,213			$	251,734