Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Consolidated net income	$ 103,879	$ 70,046
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	44,111	44,742
Amortization of debt financing costs	8,152	2,490
Impairment of intangible assets	158	0
Amortization of favorable contracts	0	35
Amortization of inventory step-up	0	4,682
Non-cash stock compensation expense	6,446	6,062
Non-cash interest expense	764	1,889
Deferred income taxes, net	(9,724)	(18,288)
Excess tax benefit from stock compensation	0	(47,997)
Non-cash gain on bargain purchase	0	(849)
Loss on extinguishment of debt	0	1,189
Loss on sale of available-for-sale securities	45	230
Other	(780)	0
Changes in operating assets and liabilities, net of acquisition:
Trade accounts receivable	(54,296)	60,449
Inventories, net	(2,652)	(21,356)
Prepaid expenses and other current assets	(23,421)	21,452
Trade accounts payable	4,778	(3,623)
Accrued expenses and other liabilities	(41,383)	59,896
NET CASH PROVIDED BY OPERATING ACTIVITIES	36,077	181,049
INVESTING ACTIVITIES:
Payments for acquisitions and equity investments, net of cash acquired	0	(27,136)
Proceeds from disposal of assets	5,966	2,372
Payments for other intangible assets	(3,375)	(800)
Purchases of property, plant and equipment	(29,726)	(15,600)
NET CASH USED IN INVESTING ACTIVITIES	(27,135)	(41,164)
FINANCING ACTIVITIES:
Net proceeds under stock option and stock purchase plans	6,176	11,916
Debt financing costs	(5,128)	(1,714)
Payment of contingent acquisition liabilities	0	(6,492)
Debt payments	(200,000)	(5,225)
Excess tax benefit from stock compensation	0	47,997
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(198,952)	46,482
Effect of exchange rate changes on cash and cash equivalents	38	44
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(189,972)	186,411
Cash and cash equivalents at beginning of period	346,266	70,679
CASH AND CASH EQUIVALENTS AT END OF PERIOD	156,294	257,090
SUPPLEMENTAL DISCLOSURES:
Amount paid for interest	21,860	25,222
Amount paid (refunded) for income taxes, net	100,801	(12,753)
Non-cash conversion of convertible notes to common shares	$ 43,214	$ 42,309