CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 5,997	$ 9,490
Adjustments to reconcile net income to net cash provided by operating activities:
Loss/(gain) on disposal of assets	(547)	52
Provision for doubtful accounts	3,754	1,657
Provision for deferred income taxes	358
Depreciation and amortization	10,199	9,285
Amortization of debt issuance costs	430	864
Compensation expense restricted stock units	2,418	1,667
Changes in operating assets and liabilities, net of effects of acquired companies:
Accounts receivable	1,537	7,216
Inventories	(10,589)	(5,197)
Prepaid expenses, other current assets, and income taxes	(12,736)	(3,860)
Accounts payable	2,126	(2,006)
Accrued expenses, accrued interest payable	2,384	3,883
Accrued compensation related costs	(15,040)	(19,544)
Other	(253)	(1,314)
Net cash provided by/(used in) operating activities	(9,962)	2,193
Cash flows from investing activities:
Purchase of property, plant and equipment (net of acquisitions)	(8,297)	(5,110)
Purchase of equipment leased to third parties under operating leases	(564)	(288)
Acquisitions (net of cash acquired)	(19,167)
Purchase of company-owned life insurance investment	(2,294)
Proceeds from sale of property, plant and equipment	522	91
Net cash used in investing activities	(29,800)	(5,307)
Cash flows from financing activities:
Borrowings under revolving credit agreement	125,000
Repayments under revolving credit agreement	(38,000)
Repayment of term loan	(1,406)	(750)
Repayment of seller's notes and other contingent considerations	(1,594)	(1,410)
Repayment of capital lease obligations	(340)	(180)
Excess tax benefit from stock based compensation	1,780	1,214
Proceeds from issuance of common stock	86	62
Net cash provided by/(used in) financing activities	85,526	(1,064)
Increase/(decrease) in cash and cash equivalents	45,764	(4,178)
Cash and cash equivalents, at beginning of period	9,860	19,211
Cash and cash equivalents, at end of period	55,624	15,033
Cash paid during the period for:
Interest	1,629	3,290
Income taxes (net of refunds)	11,159	5,591
Non-cash financing and investing activities:
Issuance of restricted stock units	8,691	9,617
Issuance of notes in connections with acquistisions	$ 9,300