Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts

(in thousands)

	Balance at Beginning of Period		Additions						Balance at End of Period
			Charged to Expense		Charged to Other Accounts*
Description							Deductions**
Year Ended December 31, 2018
Reserves and allowances deducted from asset    accounts:
Allowance for doubtful accounts and unbilled    services	$	180,687	$	17,872	$	25,300	$	21,465	$	202,394
Valuation allowance for deferred tax asset	$	21,621	$	308	$	—	$	—	$	21,929
Year Ended December 31, 2017
Reserves and allowances deducted from asset    accounts:
Allowance for doubtful accounts and unbilled    services	$	178,819	$	15,386	$	9,656	$	23,174	$	180,687
Valuation allowance for deferred tax asset	$	18,900	$	2,721	$	—	$	—	$	21,621
Year Ended December 31, 2016
Reserves and allowances deducted from asset    accounts:
Allowance for doubtful accounts and unbilled    services	$	185,754	$	8,912	$	9,501	$	25,348	$	178,819
Valuation allowance for deferred tax asset	$	13,167	$	5,733	$	—	$	—	$	18,900

* Includes estimated provision for unbilled services recorded as a reduction to revenues (i.e., fee, rate and other adjustments).

** Includes estimated direct write-offs of uncollectible and unrealizable accounts receivable.