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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 11,217 $ 3,790
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,103 3,201
Gain on sale of property and equipment (13)  
Non-cash interest expense included in net income 411 166
Share-based compensation expense 1,221 656
Bad debt expense 111 86
Inventory reserve expense 461 104
Changes in operating assets and liabilities, net of effect of acquisitions:    
Accounts receivable (2,772) 6,126
Costs and estimated earnings in excess of billings on uncompleted contracts (2,889) (6,723)
Inventories (253) 654
Prepaid expense and other current assets (4,164) (3,493)
Deferred charges and other assets 478 5,034
Accrued litigation settlement (2,536)  
Accounts payable and accrued expenses (1,554) (66)
Billings in excess of costs and estimated earnings on uncompleted contracts (674) 118
Income taxes payable (414) (1,703)
Other liabilities (436) 2,423
Net cash provided by operating activities 6,297 10,373
Cash flows from investing activities:    
Acquisitions of property and equipment (801) (533)
Proceeds from sale of property and equipment 7,475  
Net cash paid for acquisition (8,214) (104,432)
Net cash used in investing activities (1,540) (104,965)
Cash flows from financing activities:    
Net borrowings on revolving credit lines 1,557 91,961
Repayments of debt (6,637)  
Deferred financing fees paid   (2,730)
Proceeds from employee stock purchase plan and exercise of stock options 1,048 1,357
Repurchases of common stock (973) (2,365)
Dividends paid to common shareholders (4,374) (3,039)
Net cash (used in) provided by financing activities (9,379) 85,184
Net decrease in cash and cash equivalents (4,622) (9,408)
Cash and cash equivalents at beginning of period 22,661 22,994
Cash and cash equivalents at end of period 18,039 13,586
Supplemental Schedule of Non-Cash Activities:    
Common stock issued in business acquisition 500 105,397
Cash paid during the period for:    
Interest 2,061 492
Income taxes $ 7,171 $ 3,597