Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 12,918	$ (2,523)
Adjustment to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	15,017	11,217
Unrealized foreign currency (gain) loss	(620)	1,689
Net loss on interest rate swaps	342
Fair value adjustments to earnout liabilities	460	9,889
Loss on sale of property and equipment	199	222
Non-cash interest expense	803	791
Share-based compensation expense	1,724	1,318
Bad debt expense	324	504
Inventory reserve expense	964	463
Deferred income taxes	(1,111)	(657)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	15,221	(16,635)
Costs and estimated earnings in excess of billings on uncompleted contracts	3,449	(10,522)
Inventories	7,526	170
Prepaid expense and other current assets	(2,907)	286
Deferred charges and other assets	1,068	201
Accounts payable and accrued expenses	(10,010)	2,354
Billings in excess of costs and estimated earnings on uncompleted contracts	6,859	(252)
Income taxes payable	2,608	274
Other liabilities	(1,955)	(7,655)
Net cash provided by (used in) operating activities	52,879	(8,866)
Cash flows from investing activities:
Acquisitions of property and equipment	(811)	(526)
Proceeds from sale of property and equipment	301	2,396
Net cash paid for acquisition		(37,130)
Net cash used in investing activities	(510)	(35,260)
Cash flows from financing activities:
Decrease in short-term and long-term restricted cash	2,853	100
Net repayments on revolving credit lines	(13,142)	(1,242)
Borrowings of long-term debt		170,000
Repayments of debt	(31,631)	(101,966)
Financing fees paid		(2,923)
Payoff of loans on life insurance policies	(987)
Acquisition earnout payments	(9,270)	(1,755)
Proceeds from sale-leaseback transactions	14,244
Payments on capital lease and sale-leaseback financing liability	(241)
Proceeds from employee stock purchase plan and exercise of stock options	763	298
Repurchases of common stock	(188)
Dividends paid to common shareholders	(6,738)	(5,734)
Net cash provided by (used in) financing activities	(44,337)	56,778
Effect of exchange rate changes on cash and cash equivalents	(412)	(51)
Net increase in cash and cash equivalents	7,620	12,601
Cash and cash equivalents at beginning of period	34,194	18,162
Cash and cash equivalents at end of period	41,814	30,763
Cash paid during the period for
Interest	5,375	2,965
Income taxes	2,344	1,812
Non-cash transactions
Property, plant and equipment acquired under capital leases	4,385
Common stock issued in business acquisition		$ 72,145
Noncontrolling interest acquired through an issuance of a note payable (See Note 17)	5,300
Earnout settled through an exchange of accounts receivable	$ 3,272