Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES:
Net income	$ 24,844	$ 33,958
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	11,971	12,075
Amortization of debt discount and deferred issuance costs	3,588	2,936
Amortization of debt discount and deferred issuance costs	602	1,671
Accretion of interest on deferred consideration	2,343	2,793
Amortization of inventory step-up to fair value	0	3,650
Loss on extinguishment of debt	0	4,567
Changes in assets and liabilities:
Accounts receivable	(10,682)	(25,205)
Inventories	682	5,471
Prepaid expenses and other current and non-current assets	3,995	(1,842)
Accounts payable	1,802	(595)
Accrued payroll and related expenses	(6,969)	(5,988)
Other current and non-current liabilities	721	2,323
Net cash provided by operating activities:	32,897	35,814
INVESTING ACTIVITIES:
Acquisitions of property and equipment	(4,993)	(4,949)
Proceeds from sale of Summers Ridge Property	0	146,644
Net cash (used for) provided by investing activities:	(4,993)	141,695
FINANCING ACTIVITIES:
Proceeds from issuance of common stock	6,847	5,652
Payments on Revolving Credit Facility	(20,000)	(10,000)
Finance Lease, Principal Payments	38	29
Repurchases of common stock	(1,476)	(3,232)
Payment for Contingent Consideration Liability, Financing Activities	12	1,017
Payments of Term Loan	0	(101,813)
Transaction costs related to debt exchange	0	(1,357)
Net cash used for financing activities:	(14,679)	(111,796)
Effect of exchange rates on cash	18	13
Net increase in cash and cash equivalents	13,243	65,726
Cash and cash equivalents, beginning of period	43,695	36,086
Cash and cash equivalents, end of period	56,938	101,812
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING TRANSACTIONS:
Purchase of property and equipment by incurring current liabilities	$ 1,728	$ 2,067
Reduction of other current liabilities upon issuance of restricted share units	1970	0
Extinguishment of Convertible Senior Notes through issuance of common stock	$ 0	$ 118,075