CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 28,399	$ 26,136
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	12,984	11,109
Equity compensation expense	2,476	2,673
Deferred income taxes	(2,505)	1,342
Equity in undistributed income of unconsolidated joint ventures	(837)	(1,007)
Dividends received from unconsolidated joint ventures	1,741	1,809
Pension and other postretirement benefits	(174)	(398)
Loss on sale or disposal of property, plant and equipment	273	0
Benefit for doubtful accounts	(158)	(386)
Changes in assets and liabilities:
Accounts receivable	(16,948)	(7,822)
Contract assets	(4,588)	(22,040)
Inventories	(1,550)	5,813
Pension and postretirement benefit contributions	(6)	(328)
Other current assets	(2,605)	(1,438)
Accounts payable and other accrued expenses	(327)	(13,050)
Other, net	885	6,355
Net cash provided by operating activities	17,060	8,768
Investing Activities:
Capital expenditures	(12,647)	(9,122)
Proceeds from the sale of property, plant and equipment, net	7	0
Return of capital from unconsolidated joint ventures	2,625	0
Net cash used in investing activities	(10,015)	(9,122)
Financing Activities:
Repayment of debt principal and finance lease obligations	(5,098)	(149)
Payments of taxes related to net share settlement of equity awards	(7,140)	(6,407)
Proceeds from the exercise of stock options, net	285	473
Proceeds from issuance of shares to employee stock purchase plan	587	541
Share repurchases	0	(2,999)
Net cash used in financing activities	(11,366)	(8,541)
Effect of exchange rate fluctuations on cash	(1,343)	755
Net decrease in cash and cash equivalents	(5,664)	(8,140)
Cash and cash equivalents at beginning of period	167,738	181,159
Cash and cash equivalents at end of period	162,074	173,019
Supplemental Disclosures:
Accrued capital additions	2,068	1,881
Interest, net of amounts capitalized	2,161	1,329
Income taxes	$ 2,014	$ 5,645

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