CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Current assets
Cash and cash equivalents ($82,047, $94,359 and $80,195 related to consolidated construction joint ventures (“CCJVs”))	$ 195,515	$ 233,711	$ 178,068
Short-term marketable securities	20,014	67,775	47,821
Receivables, net ($38,828, $52,031 and $42,099 related to CCJVs)	492,718	479,791	484,245
Contract assets ($24,479, $0 and $0 related to CCJVs)	265,190	0	0
Costs and estimated earnings in excess of billings ($0, $1,437 and $3,124 related to CCJVs)	0	103,965	99,883
Inventories	96,024	62,497	65,495
Equity in construction joint ventures	252,467	247,826	230,448
Other current assets ($12,421, $10,384 and $7,190 related to CCJVs)	49,100	36,513	43,597
Total current assets	1,371,028	1,232,078	1,149,557
Property and equipment, net ($38,854, $38,361 and $28,398 related to CCJVs)	595,787	407,418	414,079
Long-term marketable securities	61,191	65,015	59,990
Investments in affiliates	99,495	38,469	37,170
Goodwill	246,881	53,799	53,799
Deferred income taxes, net	25,135	0	0
Other noncurrent assets	156,808	75,199	88,550
Total assets	2,556,325	1,871,978	1,803,145
Current liabilities
Current maturities of long-term debt	207,982	46,048	14,796
Accounts payable ($35,375, $34,795 and $24,976 related to CCJVs)	303,885	237,673	252,527
Contract liabilities ($40,678, $0 and $0 related to CCJVs)	91,864	0	0
Billings in excess of costs and estimated earnings ($0, $37,701 and $32,657 related to CCJVs)	0	135,146	114,180
Accrued expenses and other current liabilities ($2,147, $2,126 and $1,156 related to CCJVs)	293,959	236,407	231,048
Total current liabilities	897,690	655,274	612,551
Long-term debt	280,710	178,453	227,114
Deferred income taxes, net	5,759	1,361	5,420
Other long-term liabilities	71,180	44,085	47,983
Commitments and contingencies	0	0	0
Equity
Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding	0	0	0
Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 45,688,582 shares as of June 30, 2018, 39,871,314 shares as of December 31, 2017 and 39,837,295 shares as of June 30, 2017	457	399	398
Additional paid-in capital	516,680	160,376	155,476
Accumulated other comprehensive income	1,022	634	71
Retained earnings	737,417	783,699	715,451
Total Granite Construction Incorporated shareholders’ equity	1,255,576	945,108	871,396
Non-controlling interests	45,410	47,697	38,681
Total equity	1,300,986	992,805	910,077
Total liabilities and equity	$ 2,556,325	$ 1,871,978	$ 1,803,145