Unearned Revenue

6 Months Ended

Jun. 30, 2019

Deferred Revenue Disclosure [Abstract]

Unearned Revenue

6.  Unearned Revenue

The following tables present our unearned revenue as of the respective periods (in thousands):

June 30, 2019	Transportation		Water		Specialty		Total
California	$	590,641	$	14,382	$	119,152	$	724,175
Northwest		374,148		710		93,411		468,269
Heavy Civil		1,751,819		12,146		—		1,763,965
Federal		80		1,350		146,516		147,946
Midwest		204,749		110		158,378		363,237
Water and Mineral Services		—		224,720		—		224,720
Total	$	2,921,437	$	253,418	$	517,457	$	3,692,312

March 31, 2019
California	$	402,482	$	7,314	$	66,089	$	475,885
Northwest		344,414		1,759		71,878		418,051
Heavy Civil		1,311,518		17,173		—		1,328,691
Federal		19		—		137,592		137,611
Midwest		128,867		143		180,449		309,459
Water and Mineral Services		—		193,914		—		193,914
Total	$	2,187,300	$	220,303	$	456,008	$	2,863,611

June 30, 2018
California	$	332,252	$	17,485	$	47,601	$	397,338
Northwest		315,189		206		68,461		383,856
Heavy Civil		1,882,806		32,214		—		1,915,020
Federal		26		—		161,073		161,099
Midwest		64,191		625		268,809		333,625
Water and Mineral Services		—		225,402		—		225,402
Total	$	2,594,464	$	275,932	$	545,944	$	3,416,340