Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (3,029)	$ (38,254)	$ (5,734)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,088	18,903	16,520
Unrealized foreign currency (gain) loss	(2,103)	777	2,364
Net (gain) loss on interest rate swaps	(327)	95
Impairment of property and equipment	695
Impairment of intangible assets and goodwill	7,168	57,923	3,340
Fair value adjustments to earnout liabilities	(6,610)	4,218	11,222
Earnout payments	(7,797)
Loss on sale of property and equipment	130	217	397
Amortization of debt discount	1,033	1,054	1,062
Share based compensation expense	1,768	2,280	2,070
Bad debt expense	3,895	848	702
Inventory reserve expense	240	1,167	680
Excess tax benefit from stock options exercised		(137)	(44)
Deferred income tax benefit	(3,123)	(3,750)	(3,488)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	14,107	13,294	(15,605)
Costs and estimated earnings in excess of billings on uncompleted contracts	6,232	2,537	4,447
Inventories	887	9,449	(3,477)
Prepaid expenses and other current assets	3,530	(2,218)	3,132
Deferred charges and other assets	1,585	(73)	(191)
Accounts payable and accrued expenses	(15,847)	(6,593)	(8,582)
Billings in excess of costs and estimated earnings on uncompleted contracts	(15,186)	7,440	4,324
Income taxes payable	(1,827)	143	1,166
Other liabilities	5,061	279	(1,668)
Net cash provided by operating activities	6,570	69,599	12,637
Cash flows from investing activities:
Acquisitions of property and equipment	(1,028)	(1,076)	(763)
Cash paid for acquisitions, net of cash acquired			(37,481)
Net proceeds from sale of assets	368	657	3,205
Net cash used in investing activities	(660)	(419)	(35,039)
Cash flows from financing activities:
Decrease in restricted cash	1,425	3,137	481
Net borrowings (repayments) on revolving credit lines	2,269	(13,407)	(10,727)
Borrowings of long-term debt			170,000
Repayments of long-term debt	(11,168)	(41,768)	(107,695)
Deferred financing fees paid	(692)		(2,923)
Payoff of loans on life insurance policies		(987)
Earnout payments	(7,396)	(9,270)	(2,488)
Proceeds from sale-leaseback transactions		14,244
Payments on capital leases and sale-leaseback financing liability	(711)	(426)
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan	1,352	1,685	205
Cash paid for repurchase of common shares		(188)
Excess tax benefit from stock options exercised		137	44
Dividends paid to common shareholders	(7,792)	(8,995)	(7,977)
Net cash (used in) provided by financing activities	(22,713)	(55,838)	38,920
Effect of exchange rate changes on cash and cash equivalents	881	(1,712)	(486)
Net (decrease) increase in cash and cash equivalents	(15,922)	11,630	16,032
Cash and cash equivalents at beginning of year	45,824	34,194	18,162
Cash and cash equivalents at end of year	29,902	45,824	34,194
Non-cash transactions
Common stock issued in business acquisitions			72,145
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	5,686	6,923	4,742
Income taxes	$ 3,048	$ 6,415	$ 5,080