Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended			6 Months Ended			9 Months Ended			12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Consolidated net income (loss)	$ 37,538	$ 9,494	$ 10,842	$ 70,046	$ 8,238	$ 23,479	$ 118,013	$ (4,095)	$ 35,684	$ 150,798	$ 13,884	$ 52,362
Loss from discontinued operations, net of tax					504			504			504
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	21,109	6,675	3,289	44,742	18,565	6,651	63,835	37,270	9,925	86,924	57,831	14,476
Impairment of intangible assets							2,627			33,003
Amortization of deferred financing fees	997	226	204	2,490	6,599	411	3,576	8,870	622	4,350	9,984	842
Amortization of favorable (unfavorable) contracts	18	18	(159)	35	35	(318)	53	53	(475)	71	71	(1,905)
Amortization of inventory step-up	4,682			4,682	3,559		4,682	9,844		4,681	20,798
Non-cash stock compensation expense	2,974	1,282	1,703	6,062	3,275	4,244	9,270	5,065	5,674	12,997	7,752	7,050
Non-cash interest expense	1,186	1,249	1,226	1,889	2,655	2,263	2,342	3,955	3,426	2,778	4,871	4,634
Non-cash gain on bargain purchase	(849)			(849)			(849)			(849)		(3,707)
Gain from product divestiture					(9,329)			(9,329)			(9,329)
Deferred income taxes, net	(9,186)	(1,722)	798	(18,288)	(20,103)	1,201	(27,579)	(40,270)	1,829	(46,130)	(17,511)	2,091
Excess tax benefit from stock compensation	(29,944)	(33)	(238)	(47,997)	(722)	(745)	(47,997)	(32,047)	(1,192)	(47,997)	(29,517)	(2,928)
Non-cash settlement of product warranty liability						(1,299)			(1,299)			(1,299)
Equity in earnings of unconsolidated joint venture			(76)			(76)			(76)			(80)
Loss on extinguishment of debt	98			1,189			1,211			1,243	990
Gain (loss) on sale of available for sale security	146			230			238			237	(7)
Changes in operating assets and liabilities, net of business acquisitions:
Trade accounts receivable, net	384	(450)	(7,958)	60,449	(13,716)	(6,908)	52,056	(9,821)	(10,858)	40,287	(72,796)	(14,277)
Inventories, net	(14,559)	(5,987)	(1,441)	(21,356)	(10,227)	(4,428)	(41,177)	(14,037)	(4,575)	(50,729)	(19,385)	(3,797)
Prepaid expenses and other current assets	2,896	1,026	1,002	21,452	55,636	538	15,442	41,078	867	17,574	30,372	(648)
Trade accounts payable	7,916	6,100	(1,861)	(3,623)	11,524	(151)	9,357	1,888	1,444	(4,819)	13,963	1,975
Accrued expenses and other liabilities	19,860	5,498	(409)	59,896	(35,240)	(3,464)	86,999	14,429	1,414	93,229	27,967	2,537
NET CASH PROVIDED BY OPERATING ACTIVITIES	45,266	23,376	6,922	181,049	21,253	21,398	252,099	13,357	42,410	297,648	40,442	57,326
INVESTING ACTIVITIES:
Payments for acquisitions and equity investments, net of cash acquired	(24,637)	(7,500)	(269)	(27,136)	(579,315)	(513)	(26,908)	(929,772)	(513)	(24,408)	(987,428)	(55,482)
Proceeds from disposal of assets	2,358			2,372	58,721		2,459	58,750		2,459	59,361
Payments for other intangible assets				(800)	(6,300)		(3,135)	(8,498)		(3,835)	(8,908)
Purchases of property, plant and equipment	(7,088)	(5,198)	(2,689)	(15,600)	(11,912)	(5,159)	(21,628)	(17,778)	(7,936)	(27,934)	(29,899)	(11,642)
Distributions from unconsolidated joint venture												250
NET CASH USED IN INVESTING ACTIVITIES	(29,367)	(12,698)	(2,958)	(41,164)	(538,806)	(5,672)	(49,212)	(897,298)	(8,449)	(53,718)	(966,874)	(66,874)
FINANCING ACTIVITIES:
Proceeds from issuances of debt					600,000			1,045,044			1,045,000
Proceeds under stock option and stock purchase plans	10,958	1,022	868	11,916	2,071	1,265	11,917	6,867	2,439	11,916	8,842	3,222
Payments of contingent acquisition liabilities	(1,500)			(6,492)			(6,492)			(8,991)	(15,000)
Debt financing costs		(408)		(1,714)	(19,775)		(4,457)	(28,365)	(2,557)	(8,564)	(28,365)	(3,032)
Proceeds from warrant exercises					8,171			8,171			8,171
Excess tax benefits from stock compensation	29,944	33	238	47,997	722	745	47,997	32,047	1,192	47,997	29,517	2,928
Debt repayment	(2,613)			(5,225)			(7,838)	(82,436)		(10,450)	(85,049)
NET CASH PROVIDED BY FINANCING ACTIVITIES	36,789	647	1,106	46,482	591,189	2,010	41,127	981,328	1,074	31,908	963,116	3,118
Effect of changes in exchange rates on cash and cash equivalents	165	103	12	44	102	(105)	(228)	(99)	(218)	(251)	(183)	(173)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	52,853	11,428	5,082	186,411	73,738	17,631	243,786	97,288	34,817	275,587	36,501	(6,603)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	70,679	34,178	40,781	70,679	34,178	40,781	70,679	34,178	40,781	70,679	34,178	40,781
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 123,532	$ 45,606	$ 45,863	$ 257,090	$ 107,916	$ 58,412	$ 314,465	$ 131,466	$ 75,598	$ 346,266	$ 70,679	$ 34,178