Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net (loss) income	$ (5,734)	$ 13,077	$ 6,557
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	16,520	11,268	6,647
Unrealized foreign currency loss (gain)	2,364	2,883	(1,132)
Impairment of intangible assets	3,340
Fair value adjustments to earnout liabilities	11,222
Non-cash interest expense	1,062	561	304
Loss (gain) on sale of property and equipment	397	(62)	(97)
Share based compensation expense	2,070	1,659	1,100
Bad debt expense	702	299	99
Inventory reserve expense (benefit)	680	566	(105)
Excess tax benefit from stock options exercised	(44)	(923)
Deferred income tax (benefit) expense	(3,488)	(4,106)	1,126
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(15,605)	2,492	2,753
Inventories	(3,477)	1,993	1,680
Costs and estimated earnings in excess of billings on uncompleted contracts	4,447	(6,625)	(941)
Prepaid expenses and other current assets	3,132	1,500	1,894
Deferred charges and other assets	(191)	789	567
Accounts payable and accrued expenses	(8,582)	2,867	4,472
Accrued litigation settlement		(2,536)
Billings in excess of costs and estimated earnings on uncompleted contracts	4,324	(2,169)	(2,147)
Income taxes payable	1,166	(1,164)	(134)
Other liabilities	(1,668)	(4,704)	1,538
Net cash provided by operating activities	12,637	17,665	24,181
Cash flows from investing activities:
Acquisitions of property and equipment	(763)	(1,151)	(1,377)
Cash paid for acquisitions, net of cash acquired	(37,481)	(44,399)	(104,432)
Net proceeds from sale of assets	3,205	7,738	215
Net cash used in investing activities	(35,039)	(37,812)	(105,594)
Cash flows from financing activities:
Decrease (increase) in restricted cash	481	(500)
Net (repayments) borrowings on revolving credit lines	(10,727)	(2,909)	3,366
Borrowings of long-term debt	170,000	35,000	100,000
Repayments of long-term debt	(107,695)	(8,867)	(14,218)
Deferred financing fees paid	(2,923)	(370)	(2,730)
Earnout payments	(2,488)	(1,402)
Proceeds from employee stock purchase plan and exercise of stock options	205	1,383	1,364
Cash paid for repurchase of common shares		(973)	(2,365)
Excess tax benefit from stock options exercised	44	923
Dividends paid to common shareholders	(7,977)	(5,937)	(4,337)
Net cash provided by financing activities	38,920	16,348	81,080
Effect of exchange rate changes on cash and cash equivalents	(486)
Net increase (decrease) in cash and cash equivalents	16,032	(3,799)	(333)
Cash and cash equivalents at beginning of year	18,162	21,961	22,294
Cash and cash equivalents at end of year	34,194	18,162	21,961
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Common stock issued in business acquisitions	72,145	6,335	104,753
Cash paid during the year for:
Interest	4,742	2,816	1,838
Income taxes	$ 5,080	$ 8,665	$ 2,237