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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Cash flows from operating activities: |  |
Net income (loss) | $ (17,378) | $ 6,529
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities: |  |
Bad debt expense | 17 | 320
Depreciation and amortization | 7,476 | 12,878
Amortization of deferred revenue | (1,887) | (2,654)
Asset impairment | 389 | 0
Loss (gain) on sale of assets | 259 | (369)
Deferred income taxes | (8,784) | 3,899
Compensation expense - restricted stock | 1,583 | 1,619
Changes in operating assets and liabilities: |  |
Contracts receivable and retainage, net | (17,927) | 9,783
Contracts in progress | (4,814) | 1,550
Prepaid expenses and other assets | 201 | (1,396)
Inventory | 102 | (1,234)
Accounts payable | 10,308 | (7,522)
Advance billings on contracts | 4,665 | 247
Deferred revenue | (5,078) | (8,718)
Deferred compensation | 393 | 0
Accrued expenses | (795) | 2,769
Accrued contract losses | 3,127 | (5,974)
Current income taxes and other | 207 | 105
Net cash (used in) provided by operating activities | (27,936) | 11,832
Cash flows from investing activities: |  |
Capital expenditures | (1,824) | (3,290)
Net cash received in acquisition | 0 | 1,588
Proceeds from the sale of equipment | 2,120 | 5,548
Net cash provided by investing activities | 296 | 3,846
Cash flows from financing activities: |  |
Tax payments made on behalf of employees from withheld, vested shares of common stock | (884) | (146)
Payment of financing cost | (61) | 0
Payments of dividends on common stock | (299) | (295)
Net cash used in financing activities | (1,244) | (441)
Net change in cash and cash equivalents | (28,884) | 15,237
Cash and cash equivalents at beginning of period | 51,167 | 34,828
Cash and cash equivalents at end of period | $ 22,283 | $ 50,065

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