Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	As of March 31, 2017								As of December 31, 2016
	Fair Value Hierarchy								Fair Value Hierarchy
(in thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents (a)	$	104,817	$	104,817	$	—	$	—	$	146,103	$	146,103	$	—	$	—
Restricted cash (a)		60,158		60,158		—		—		50,504		50,504		—		—
Investments in lieu of retainage (b)		53,852		50,317		3,535		—		51,266		46,855		4,411		—
Total	$	218,827	$	215,292	$	3,535	$	—	$	247,873	$	243,462	$	4,411	$	—

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(a)Includes money market funds with original maturity dates of three months or less.

(b)Investments in lieu of customer retainage are classified as accounts receivable and are comprised of money market funds and municipal bonds, the majority of which are rated Aa3 or better. The fair values of the money market funds are measured using quoted market prices; therefore, they are classified as Level 1 assets. The fair values of municipal bonds are measured using readily available pricing sources for comparable instruments; therefore, they are classified as Level 2 assets.