CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Current assets
Cash and cash equivalents ($91,903, $94,359 and $60,406 related to consolidated construction joint ventures (“CCJVs”))	$ 193,581	$ 233,711	$ 169,501
Short-term marketable securities	39,961	67,775	67,824
Receivables, net ($17,598, $52,031 and $55,215 related to CCJVs)	330,192	479,791	351,091
Contract assets ($23,889, $0 and $0 related to CCJVs)	178,663	0	0
Costs and estimated earnings in excess of billings ($0, $1,437 and $2,965 related to CCJVs)	0	103,965	90,112
Inventories	71,295	62,497	58,781
Equity in construction joint ventures	254,816	247,826	235,683
Other current assets ($14,180, $10,384 and $7,047 related to CCJVs)	43,125	36,513	54,542
Total current assets	1,111,633	1,232,078	1,027,534
Property and equipment, net ($44,655, $38,361 and $26,161 related to CCJVs)	409,708	407,418	412,490
Long-term marketable securities	67,305	65,015	59,989
Investments in affiliates	38,682	38,469	36,410
Goodwill	53,799	53,799	53,799
Deferred income taxes, net	3,718	0	0
Other noncurrent assets	74,382	75,199	87,997
Total assets	1,759,227	1,871,978	1,678,219
Current liabilities
Current maturities of long-term debt	47,298	46,048	14,796
Accounts payable ($31,854, $34,795 and $19,386 related to CCJVs)	226,253	237,673	170,006
Contract liabilities ($33,760, $0 and $0 related to CCJVs)	71,030	0	0
Billings in excess of costs and estimated earnings ($0, $37,701 and $34,467 related to CCJVs)	0	135,146	91,527
Accrued expenses and other current liabilities ($2,090, $2,126 and $1,426 related to CCJVs)	233,637	236,407	224,850
Total current liabilities	578,218	655,274	501,179
Long-term debt	176,011	178,453	228,306
Deferred income taxes, net	0	1,361	5,609
Other long-term liabilities	40,104	44,085	47,066
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: 40,047,187 shares as of March 31, 2018, 39,871,314 shares as of December 31, 2017 and 39,815,232 shares as of March 31, 2017	400	399	398
Additional paid-in capital	162,038	160,376	152,805
Accumulated other comprehensive income (loss)	1,197	634	(257)
Retained earnings	751,801	783,699	706,571
Total Granite Construction Incorporated shareholders’ equity	915,436	945,108	859,517
Non-controlling interests	49,458	47,697	36,542
Total equity	964,894	992,805	896,059
Total liabilities and equity	$ 1,759,227	$ 1,871,978	$ 1,678,219