Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net income	$ 33,958	$ 14,290
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	12,075	5,690
Amortization of debt discount and deferred issuance costs	2,936	1,921
Amortization of debt discount and deferred issuance costs	1,671	1,365
Accretion of interest on deferred consideration	2,793	0
Amortization of inventory step-up to fair value	3,650	0
Loss on extinguishment of debt	4,567	0
Changes in assets and liabilities:
Accounts receivable	(25,205)	4,048
Inventories	5,471	3,576
Income taxes receivable	3,097	2,063
Prepaid expenses and other current and non-current assets	(4,939)	(1,540)
Accounts payable	(595)	(4,317)
Accrued payroll and related expenses	(5,988)	(1,493)
Other current and non-current liabilities	2,323	3,972
Net cash provided by operating activities:	35,814	29,575
INVESTING ACTIVITIES:
Acquisitions of property, equipment and intangibles	(4,949)	(3,712)
Proceeds from sale of Summers Ridge Property	146,644	0
Net cash provided by (used for) investing activities:	141,695	(3,712)
FINANCING ACTIVITIES:
Proceeds from issuance of common stock	5,652	3,065
Payments on revolving credit facility	(10,000)	0
Payments on lease obligation	(29)	(21)
Repurchases of common stock	(3,232)	(437)
Payments on acquisition contingencies	(1,017)	(486)
Payments on Term Loan	(101,813)
Transaction costs related to debt exchange	(1,357)	0
Net cash (used for) provided by financing activities:	(111,796)	2,121
Effect of exchange rates on cash	13	2
Net increase in cash and cash equivalents	65,726	27,986
Cash and cash equivalents, beginning of period	36,086	169,508
Cash and cash equivalents, end of period	101,812	197,494
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING TRANSACTIONS:
Purchase of property, equipment and intangibles by incurring current liabilities	2,067	1,130
Decrease of accrued payroll and related expenses upon issuance of common stock	0	903
Extinguishment of Convertible Senior Notes through issuance of common stock	118,075	$ 0
Senior 3 Point 25 Percent Convertible Notes Due 2020 [Member] | Convertible Debt [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on extinguishment of debt	$ 1,600