Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net (loss) income	$ (38,254)	$ (5,734)	$ 13,077
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	18,903	16,520	11,268
Unrealized foreign currency loss	777	2,364	2,883
Net loss on interest rate swaps	95
Intangible asset and goodwill impairment	57,923	3,340
Fair value adjustments to earnout liabilities	4,218	11,222
Non-cash interest expense	1,054	1,062	561
Loss (gain) on sale of property and equipment	217	397	(62)
Share based compensation expense	2,280	2,070	1,659
Bad debt expense	848	702	299
Inventory reserve expense	1,167	680	566
Excess tax benefit from stock options exercised	(137)	(44)	(923)
Deferred income tax benefit	(3,750)	(3,488)	(4,106)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	13,294	(15,605)	2,492
Costs and estimated earnings in excess of billings on uncompleted contracts	2,537	4,447	(6,625)
Inventories	9,449	(3,477)	1,993
Prepaid expenses and other current assets	(2,218)	3,132	1,500
Deferred charges and other assets	(73)	(191)	789
Accounts payable and accrued expenses	(6,593)	(8,582)	2,867
Accrued litigation settlement		(200)	(2,536)
Billings in excess of costs and estimated earnings on uncompleted contracts	7,440	4,324	(2,169)
Income taxes payable	143	1,166	(1,164)
Other liabilities	279	(1,668)	(4,704)
Net cash provided by operating activities	69,599	12,637	17,665
Cash flows from investing activities:
Acquisitions of property and equipment	(1,076)	(763)	(1,151)
Cash paid for acquisitions, net of cash acquired		(37,481)	(44,399)
Net proceeds from sale of assets	657	3,205	7,738
Net cash used in investing activities	(419)	(35,039)	(37,812)
Cash flows from financing activities:
Decrease (increase) in restricted cash	3,137	481	(500)
Net repayments on revolving credit lines	(13,407)	(10,727)	(2,909)
Borrowings of long-term debt		170,000	35,000
Repayments of long-term debt	(41,768)	(107,695)	(8,867)
Deferred financing fees paid		(2,923)	(370)
Payoff of loans on life insurance policies	(987)
Acquisition earnout payments	(9,270)	(2,488)	(1,402)
Proceeds from sale-leaseback transactions	14,244
Payments on capital leases and sale-leaseback financing liability	(426)
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan	1,685	205	1,383
Cash paid for repurchase of common shares	(188)		(973)
Excess tax benefit from stock options exercised	137	44	923
Dividends paid to common shareholders	(8,995)	(7,977)	(5,937)
Net cash (used in) provided by financing activities	(55,838)	38,920	16,348
Effect of exchange rate changes on cash and cash equivalents	(1,712)	(486)
Net increase (decrease) in cash and cash equivalents	11,630	16,032	(3,799)
Cash and cash equivalents at beginning of year	34,194	18,162	21,961
Cash and cash equivalents at end of year	45,824	34,194	18,162
Non-cash transactions
Common stock issued in business acquisitions		72,145	6,335
Property, plant and equipment acquired under capital leases	4,385
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
Accrual of share repurchase	1,050
Cash paid during the year for:
Interest	6,923	4,742	2,816
Income taxes	$ 6,415	$ 5,080	$ 8,665