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CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Cash flows from operating activities: |  |  |
Net income | $ 76,850 | $ 27,725 | $ 37,151
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 57,614 | 61,433 | 58,408
Amortization of intangible assets | 8,689 | 6,597 | 6,793
Goodwill and intangible asset impairment | 477 | 2,716 | 401
Stock-based compensation expense | 1,126 | 1,627 | 1,050
Gain on short-term investments | (5,817) |  |
Gain on sale of property and equipment | (4,434) | (4,677) | (2,116)
Net deferred tax liabilities (assets) | 3,741 | 10,905 | (7,004)
Other non-cash items | 203 | 174 | 165
Changes in assets and liabilities: |  |  |
Customer retention deposits | (519) | 2,117 | (2,117)
Accounts receivable | 40,546 | (65,806) | 19,528
Costs and estimated earnings in excess of billings | (20,894) | (22,163) | (47,499)
Other current assets | 16,976 | 17,491 | 4,784
Other long-term assets | 28 | (1,792) | 189
Accounts payable | (30,547) | 42,934 | (5,086)
Billings in excess of costs and estimated earnings | 45,981 | (27,519) | (19,619)
Contingent earnout liabilities | (484) |  | (6,722)
Accrued expenses and other current liabilities | (972) | 14,492 | 11,729
Other long-term liabilities | 378 | (3,677) | (1,658)
Net cash provided by operating activities | 188,942 | 62,577 | 48,377
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (79,782) | (58,027) | (67,097)
Proceeds from sale of property and equipment | 8,736 | 9,603 | 9,889
Purchase of short-term investments | (13,588) |  |
Sale of short-term investments | 19,405 |  | 30,992
Cash paid for acquisitions | (66,205) | (10,997) | (22,302)
Net cash used in investing activities | (131,434) | (59,421) | (48,518)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt | 55,000 | 45,000 | 75,278
Repayment of capital leases | (322) | (793) | (1,336)
Repayment of long-term debt | (61,816) | (57,719) | (43,927)
Payment of debt issuance costs for amended and restated credit agreement | (631) |  |
Proceeds from issuance of common stock purchased under a long-term incentive plan | 1,148 | 1,440 | 1,621
Cash distribution to non-controlling interest holder |  |  | (29)
Repurchase of common stock | (4,999) | (4,999) |
Dividends paid | (11,326) | (11,384) | (9,809)
Net cash (used in) provided by financing activities | (22,946) | (28,455) | 21,798
Net change in cash and cash equivalents | 34,562 | (25,299) | 21,657
Cash and cash equivalents at beginning of the period | 135,823 | 161,122 | 139,465
Cash and cash equivalents at end of the period | 170,385 | 135,823 | 161,122
Cash paid: |  |  |
Interest | 7,965 | 8,819 | 7,688
Income taxes, net of refunds received | 25,984 | 8,624 | 18,696
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES |  |  |
Obligations incurred for the acquisition of property | 4,163 |  | 25
Dividends declared and not yet paid | $ 3,087 | $ 2,839 | $ 2,842

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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