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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (3,494) $ 7,225
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 6,782 4,022
Amortization of deferred loan costs 1,232 1,200
Fair value adjustment of stock warrants 4,563 19
Deferred income taxes 28 80
Bad debt expense 161 (336)
Stock compensation expense 3,369 1,908
Net gain on sale of assets (114) (15)
Changes in assets and liabilities:    
Receivables (36,129) (21,823)
Inventories (6,976) (15,438)
Other current assets 1,876 1,728
Other assets and liabilities 1,046 (114)
Accounts payable 34,670 19,663
Accrued liabilities 10,543 2,573
Net cash provided by operating activities 17,557 692
Cash flows from investing activities:    
Purchases of property, plant and equipment (14,331) (12,121)
Proceeds from sale of property, plant and equipment 180 16
Cash used for acquisitions, net (5,797) (8,726)
Net cash used in investing activities (19,948) (20,831)
Cash flows from financing activities:    
Borrowings under revolving credit facility 25,000  
Payments of long-term debt and other loans (36) (33)
Deferred loan costs   (34)
Payments of transaction costs (326)  
Exercise of stock options 1,117 1,355
Repurchase of common stock (986) (1,306)
Net cash provided by (used in) financing activities 24,769 (18)
Net change in cash and cash equivalents 22,378 (20,157)
Cash and cash equivalents at beginning of period 17,773 54,696
Cash and cash equivalents at end of period $ 40,151 $ 34,539