Unearned Revenue

6 Months Ended

Jun. 30, 2018

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, 2018

	Construction		Large Project Construction		Total
California	$	364,305	$	33,033	$	397,338
Northwest		383,855		—		383,855
Heavy Civil		43,959		2,032,151		2,076,110
Kenny		125,159		246,699		371,858
Water and Mineral Services		187,179		—		187,179
Total	$	1,104,457	$	2,311,883	$	3,416,340

March 31, 2018

	Construction		Large Project Construction		Total
California	$	333,866	$	48,162	$	382,028
Northwest		362,225		—		362,225
Heavy Civil		54,596		2,233,174		2,287,770
Kenny		130,289		286,269		416,558
Total	$	880,976	$	2,567,605	$	3,448,581

January 1, 2018

	Construction		Large Project Construction		Total
California	$	365,771	$	40,283	$	406,054
Northwest		262,117		53,465		315,582
Heavy Civil		43,016		2,356,769		2,399,785
Kenny		154,524		307,904		462,428
Total	$	825,428	$	2,758,421	$	3,583,849