CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 18,407	$ 30,908
Adjustments to reconcile net income to net cash (used in) provided by operating activities (net of effect of acquisitions):
Depreciation	30,014	28,139
Amortization of intangible assets	5,161	3,611
Intangible asset impairment		477
Stock-based compensation expense	430	690
Gain on sale of property and equipment	(1,580)	(3,208)
Other non-cash items	68	87
Changes in assets and liabilities:
Accounts receivable	18,331	53,650
Contract assets	(64,074)	(22,627)
Other current assets	(6,036)	4,604
Other long-term assets	(499)	381
Accounts payable	2,115	(37,060)
Contract liabilities	(18,220)	45,647
Accrued liabilities	13,647	8,298
Other long-term liabilities	1,520	2,692
Net cash (used in) provided by operating activities	(716)	116,289
Cash flows from investing activities:
Purchase of property and equipment	(46,107)	(44,697)
Issuance of a note receivable	(15,000)
Proceeds from a note receivable	15,000
Proceeds from sale of property and equipment	5,811	4,664
Cash paid for acquisitions, net of cash and restricted cash acquired	(111,030)	(66,205)
Net cash used in investing activities	(151,326)	(106,238)
Cash flows from financing activities:
Borrowings under revolving line of credit	170,000
Proceeds from issuance of long-term debt	19,467
Repayment of long-term debt and capital leases	(28,048)	(24,679)
Proceeds from issuance of common stock purchased under a long-term incentive plan	1,498	1,148
Repurchase of common stock		(4,999)
Dividends paid	(6,179)	(5,668)
Net cash provided by (used in) financing activities	156,738	(34,198)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(185)
Net change in cash, cash equivalents and restricted cash	4,511	(24,147)
Cash, cash equivalents and restricted cash at beginning of the period	170,385	135,823
Cash, cash equivalents and restricted cash at end of the period	174,896	111,676
Cash paid:
Interest	4,191	4,663
Income taxes, net of refunds received	3,610	15,554
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Obligations incurred for the acquisition of property		4,163
Dividends declared and not yet paid	$ 3,092	$ 2,829

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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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.

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