CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Net income	$ 26,173	$ 13,382
Adjustments to reconcile net income to net cash provided by operating activities:
Loss from discontinued operations, net of tax	0	10,370
Depreciation and amortization	36,267	24,362
Deferred income tax	(642)	1,565
Amortization of debt issuance costs	1,236	1,060
Non-cash interest expense	4,168	3,744
Loss on disposal of property and equipment	1,184	38
Change in fair value of contingent consideration	251	239
Share-based compensation	7,897	5,419
Changes in assets and liabilities, net of business acquisitions:
Accounts receivable	(13,525)	(5,192)
Inventories	(7,362)	(6,118)
Prepaid expenses and other current assets	4,362	903
Other non-current assets	(571)	(1,806)
Accounts payable, accrued expenses and other current liabilities	2,237	23,951
Deferred revenue	2,510	(805)
Other non-current liabilities	(1,076)	700
Net cash provided by operating activities of continuing operations	63,109	71,812
Net cash used in operating activities of discontinued operations	0	(12,209)
Net cash provided by operating activities	63,109	59,603
INVESTING ACTIVITIES:
Purchases of property and equipment	(19,162)	(14,953)
Sale of property and equipment	0	1,438
Cash received from business acquisition purchase price adjustment	224	1,831
Change in restricted cash	4,165	0
Net cash used in investing activities of continuing operations	(14,773)	(11,684)
Net cash used in investing activities of discontinued operations	0	(7,060)
Net cash used in investing activities	(14,773)	(18,744)
FINANCING ACTIVITIES:
Borrowings under senior credit facility	15,000	35,000
Repayments under senior credit facility	(28,750)	(15,000)
Principal payments under capital lease obligations	(323)	(396)
Proceeds from exercised stock options	9,260	7,345
Cash taxes paid in net equity settlement	(4,269)	(6,359)
Net cash (used in) provided by financing activities	(9,082)	20,590
Effect of exchange rate changes on cash and cash equivalents	(583)	(2,146)
Net increase in cash and cash equivalents	38,671	59,303
Cash and cash equivalents at beginning of period	48,132	71,734
Cash and cash equivalents at end of period	$ 86,803	$ 131,037