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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
OPERATING ACTIVITIES:    
Net income (loss) $ 2,206 $ (6,028)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 13,961 11,389
Non-cash impairment charges 600 0
Deferred income tax provision (benefit) 1,563 (1,055)
Amortization of debt issuance costs 608 545
Non-cash interest expense 1,666 1,610
Loss on disposal of property and equipment 0 1,865
Share-based compensation 2,471 2,072
Excess tax benefits from stock-based compensation arrangements (541) (23)
Changes in assets and liabilities, net of business acquisitions:    
Accounts receivable 5,671 2,109
Inventories (8,516) (6,739)
Prepaid expenses and other current assets (1,582) 2,704
Other non-current assets (127) (115)
Accounts payable, accrued expenses and other current liabilities (4,438) (515)
Deferred revenue 21 391
Other non-current liabilities (2,309) (364)
Net cash provided by operating activities 11,254 7,846
INVESTING ACTIVITIES:    
Purchases of property and equipment (11,335) (10,853)
Sales of property and equipment 0 532
Cash used in business acquisition, net of cash acquired (235,000) (2,766)
Net cash used in investing activities (246,335) (13,087)
FINANCING ACTIVITIES:    
Borrowings under senior credit facility 235,000 0
Principal payments under capital lease obligations (122) 0
Proceeds from exercised stock options 7,755 234
Excess tax benefits from stock-based compensation arrangements 541 23
Net cash provided by financing activities 243,174 257
Effect of exchange rate changes on cash and cash equivalents 331 (2,263)
Net change in cash and cash equivalents 8,424 (7,247)
Cash and cash equivalents at beginning of period 120,614 96,938
Cash and cash equivalents at end of period $ 129,038 $ 89,691