Receivables, Other Current Assets and Other Accrued Expenses and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Prepaid Expense and Other Assets, Current [Abstract]

Schedule of Receivables, Other Current Assets and Other Accrued Expenses and Liabilities

The Company's receivables, other current assets and other accrued expenses and liabilities comprise the following balances:

(in thousands)	June 30, 2018		December 31, 2017
Accounts receivable, less allowance for doubtful accounts of $7,300 and $6,800, respectively	$	258,280	$	124,659
Receivables related to unrecognized revenue	$	116,119	$	215,155
Income taxes receivable, including overpayments and refunds	35,615		21,663
Prepaid expenses and other current assets	36,808		27,002
Total other receivables and current assets	$	188,542	$	263,820
Accrued vacation	$	22,108	$	17,466
Accrued expenses and other current liabilities	60,196		68,869
Total other accrued expenses and liabilities	$	82,304	$	86,335