CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 18,616	$ 23,569
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
(Gain)/Loss on disposal of assets	(939)	169
Reduction of seller notes and earnouts	(318)	(57)
Provision for doubtful accounts	8,808	4,591
Provision for deferred income taxes	358	(2,564)
Depreciation and amortization	22,332	18,795
Amortization of debt issuance costs	861	8,273
Compensation expense on restricted stock units	5,265	4,060
Changes in operating assets and liabilities, net of effects of acquired companies:
Accounts receivable	(23,564)	(7,712)
Inventories	(14,467)	(7,940)
Prepaid expenses, other assets, and income taxes receivable	(5,104)	(2,746)
Accounts payable	(6,430)	7,611
Accrued expenses, accrued interest payable	1,080	(202)
Accrued compensation related costs	(13,772)	(18,612)
Other	(211)	409
Net cash (used in) provided by operating activities	(7,485)	27,644
Cash flows from investing activities:
Purchase of property, plant and equipment (net of acquisitions)	(20,248)	(15,939)
Purchase of equipment leased to third parties under operating leases	(1,438)	(2,106)
Acquisitions (net of cash acquired)	(34,201)	(4,741)
Purchase of company-owned life insurance investment	(2,294)
Proceeds from sale of property, plant and equipment	1,079	894
Net cash used in investing activities	(57,102)	(21,892)
Cash flows from financing activities:
Borrowings under term loan		225,000
Repayment of term loan	(2,813)	(293,300)
Borrowings under revolving credit agreement	228,000	120,000
Repayments under revolving credit agreement	(163,000)	(65,000)
Repayment of seller's notes and other contingent considerations	(3,765)	(4,042)
Repayment of capital lease obligations	(754)	(411)
Deferred financing costs		(3,665)
Excess tax benefit from stock based compensation	1,875	2,159
Proceeds from issuance of common stock	86	1,628
Purchase and retirement of treasury stock		(1,566)
Net cash provided by (used in) financing activities	59,629	(19,197)
Decrease in cash and cash equivalents	(4,958)	(13,445)
Cash and cash equivalents, at beginning of period	9,860	19,211
Cash and cash equivalents, at end of period	4,902	5,766
Cash paid during the period for:
Interest	10,537	13,105
Income taxes (net of refunds)	11,538	14,973
Non-cash financing and investing activities:
Issuance of restricted stock units	9,561	9,617
Issuance of notes in connections with acquisitions	12,900	300
Capital lease obligations	$ 10,717	$ 220