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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and cash equivalents | $ 138,569 | $ 192,868
Accounts receivable | 1,272,932 | 1,265,717
Retainage receivable | 490,751 | 535,939
Other current assets | 141,472 | 89,316
Accumulated depreciation | 337,101 | 359,188
PROPERTY AND EQUIPMENT, net of accumulated depreciation | 490,614 | 467,499
Accounts payable | 625,436 | 699,971
Billings in excess of costs and estimated earnings | 574,392 | 456,869
Unamortized discounts and debt issuance costs | $ 40,437 | $ 45,631
Preferred stock, shares authorized | 1,000,000 | 1,000,000
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred stock, shares issued | 0 | 0
Common stock, shares authorized | 75,000,000 | 75,000,000
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shares issued | 50,010,863 | 49,781,010
Common stock, shares outstanding | 50,010,863 | 49,781,010
Variable Interest Entity, Primary Beneficiary [Member] |  |
Cash and cash equivalents | $ 53,575 | $ 53,067
Accounts receivable | 57,008 | 30,003
Retainage receivable | 24,288 | 12,410
Other current assets | 35,657 | 0
PROPERTY AND EQUIPMENT, net of accumulated depreciation | 41,150 | 11,641
Accounts payable | 44,118 | 19,243
Billings in excess of costs and estimated earnings | $ 240,545 | $ 120,952

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