Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Cash and cash equivalents	$ 175,022	$ 395,647	$ 377,620
Receivables, net	527,277	464,588	543,914
Contract assets	190,187	145,437	154,542
Other current assets	167,349	177,210	44,076
Property and equipment, net	464,593	433,504	432,896
Accounts payable	331,728	324,313	334,158
Contract liabilities	179,322	200,041	166,415
Accrued expenses and other current liabilities	$ 435,061	$ 452,829	$ 459,517
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000	3,000,000
Preferred stock, shares outstanding (in shares)	0	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000	150,000,000
Common stock, shares issued (in shares)	44,078,469	45,840,260	45,818,719
Common stock, shares outstanding (in shares)	44,078,469	45,840,260	45,818,719
Consolidated Construction Corporate Joint Venture [Member]
Cash and cash equivalents	$ 77,943	$ 92,783	$ 107,854
Receivables, net	69,347	49,534	49,408
Contract assets	70,453	50,054	41,815
Other current assets	6,056	8,091	12,142
Property and equipment, net	13,596	14,920	20,206
Accounts payable	63,541	55,012	62,117
Contract liabilities	61,868	69,328	66,193
Accrued expenses and other current liabilities	$ 8,025	$ 5,514	$ 5,186