Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Cash and Cash Equivalents

The Company’s cash and cash equivalent balances comprise the following:

	March 31, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	560,670	63.3	$	568,587	64.5
Money market funds	324,823		36.7	312,914		35.5
Total	$	885,493		$	881,501