16. Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales	$ 621,300	$ 534,100	$ 504,700	$ 500,100	$ 571,500	$ 508,700	$ 516,800	$ 471,200	$ 2,160,153	$ 2,068,172	$ 2,019,441
Operating Income (Loss)	45,900	30,700	1,100	20,100	(28,200)	22,700	26,900	20,200	116,650	53,194	166,708
Cost of goods sold	276,100	235,200	231,400	230,100	257,100	229,200	236,600	207,200	972,754	930,085	897,771
Gross profit	345,200	298,900	273,300	270,000	314,400	279,500	280,200	264,000	1,187,399	1,138,087	1,121,670
Selling, general and administrative expense	202,300	198,700	213,000	194,900	220,000	201,500	205,500	189,700	808,942	816,724	761,990
Research and development expense	76,100	62,100	62,600	49,500	57,600	49,900	49,800	48,600	250,301	205,864	192,972
Net Income (Loss) Attributable to Parent	$ 82,700	$ 22,100	$ 5,000	$ 12,400	$ (18,700)	$ 17,100	$ 16,600	$ 11,000	$ 122,249	$ 26,000	$ 109,239
Earnings Per Share, Basic	$ 2.78	$ 0.74	$ 0.17	$ 0.42	$ (0.63)	$ 0.58	$ 0.56	$ 0.38	$ 4.12	$ 0.88	$ 3.74
Earnings Per Share, Diluted	$ 2.75	$ 0.73	$ 0.17	$ 0.41	$ (0.63)	$ 0.58	$ 0.56	$ 0.37	$ 4.07	$ 0.88	$ 3.71
Income Tax Expense (Benefit)	$ 36,800	$ (8,600)	$ 3,900	$ (7,700)	$ 9,500	$ (5,600)	$ (10,300)	$ (9,200)	$ 24,444	$ (15,560)	$ (36,608)
Tax Misstatement [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Income Tax Expense (Benefit)	(2,900)
Scenario, Previously Reported [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales	620,400	535,000	504,700	500,100	571,500	508,700	516,800	471,200
Operating Income (Loss)	37,700	38,900	1,100	20,100	(28,200)	22,700	26,900	20,200
Cost of goods sold	280,800	230,500	231,400	230,100	257,100	229,200	236,600	207,200
Gross profit	339,600	304,500	273,300	270,000	314,400	279,500	280,200	264,000
Selling, general and administrative expense	204,200	196,800	213,000	194,900	220,000	201,500	205,500	189,700
Research and development expense	76,800	61,400	62,600	49,500	57,600	49,900	49,800	48,600
Net Income (Loss) Attributable to Parent	$ 69,900	$ 27,400	$ 5,000	$ 12,400	$ (20,600)	$ 18,400	$ 18,000	$ 12,300		$ 28,125	$ 113,093
Earnings Per Share, Basic	$ 2.35	$ 0.92	$ 0.17	$ 0.42	$ (0.70)	$ 0.63	$ 0.61	$ 0.42		$ 0.96	$ 3.87
Earnings Per Share, Diluted	$ 2.32	$ 0.91	$ 0.17	$ 0.41	$ (0.70)	$ 0.62	$ 0.61	$ 0.42		$ 0.95	$ 3.85
Income Tax Expense (Benefit)	$ 32,200	$ (11,500)	$ 3,900	$ (7,700)	$ 7,600	$ (4,300)	$ (8,900)	$ (7,900)		$ (13,435)	$ (32,754)
Scenario, Adjustment [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales	900	(900)	0	0	0	0	0	0
Operating Income (Loss)	8,200	(8,200)	0	0	0	0	0	0
Cost of goods sold	(4,700)	4,700	0	0	0	0	0	0
Gross profit	5,600	(5,600)	0	0	0	0	0	0
Selling, general and administrative expense	(1,900)	1,900	0	0	0	0	0	0
Research and development expense	(700)	700	0	0	0	0	0	0
Net Income (Loss) Attributable to Parent	$ 12,800	$ (5,300)	$ 0	$ 0	$ 1,900	$ (1,300)	$ (1,400)	$ (1,300)		$ (2,125)	$ (3,854)
Earnings Per Share, Basic	$ 0.43	$ (0.18)	$ 0	$ 0	$ 0.07	$ (0.05)	$ (0.05)	$ (0.04)		$ (0.08)	$ (0.13)
Earnings Per Share, Diluted	$ 0.43	$ (0.18)	$ 0	$ 0	$ 0.07	$ (0.04)	$ (0.05)	$ (0.05)		$ (0.07)	$ (0.14)
Income Tax Expense (Benefit)	$ 4,600	$ 2,900	$ 0	$ 0	$ 1,900	$ (1,300)	$ (1,400)	$ (1,300)		$ (2,125)	$ (3,854)
Inventories [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Cost of goods sold		$ 3,500
Employee Benefit Expense Misstatement [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Operating Income (Loss)	3,800
RainDance Technologies, Inc. [Member] \| Scenario, Adjustment [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net sales	$ 900

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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