Segment Reporting - Allocated Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Cost of sales	$ 258,250	$ 262,250	$ 524,996	$ 506,709
Gross profit	379,342	357,853	738,932	689,450
Operating Expenses:
Sales and marketing	94,181	101,364	210,324	207,948
General and administrative	60,268	59,955	126,080	120,316
Research and development	31,645	32,259	64,955	63,773
Income from operations	193,248	164,275	337,573	297,413
Operating Segments | CAG
Operating Expenses:
Income from operations	167,969	141,190	286,628	252,909
Operating Segments | Water
Operating Expenses:
Income from operations	12,258	16,722	28,140	30,537
Operating Segments | LPD
Operating Expenses:
Income from operations	8,249	6,568	17,912	12,857
Operating Segments | Other
Operating Expenses:
Income from operations	$ 4,772	(205)	$ 4,893	1,110
Restatement Adjustment | Operating Segments | CAG
Segment Reporting Information [Line Items]
Cost of sales		344		162
Gross profit		(344)		(162)
Operating Expenses:
Sales and marketing		(18)		111
General and administrative		(893)		(1,095)
Research and development		3,960		7,518
Total operating expenses		3,049		6,534
Income from operations		(3,393)		(6,696)
Restatement Adjustment | Operating Segments | Water
Segment Reporting Information [Line Items]
Cost of sales		15		7
Gross profit		(15)		(7)
Operating Expenses:
Sales and marketing		(1)		5
General and administrative		(179)		(219)
Research and development		10		19
Total operating expenses		(170)		(195)
Income from operations		155		188
Restatement Adjustment | Operating Segments | LPD
Segment Reporting Information [Line Items]
Cost of sales		19		9
Gross profit		(19)		(9)
Operating Expenses:
Sales and marketing		(1)		6
General and administrative		(206)		(253)
Research and development		13		24
Total operating expenses		(194)		(223)
Income from operations		175		214
Restatement Adjustment | Operating Segments | Other
Segment Reporting Information [Line Items]
Cost of sales		8		4
Gross profit		(8)		(4)
Operating Expenses:
Sales and marketing		0		0
General and administrative		949		1,164
Research and development		0		0
Total operating expenses		949		1,164
Income from operations		(957)		(1,168)
Previously Reported | Unallocated
Segment Reporting Information [Line Items]
Cost of sales		(386)		(182)
Gross profit		386		182
Operating Expenses:
Sales and marketing		20		(122)
General and administrative		329		403
Research and development		(3,983)		(7,561)
Total operating expenses		(3,634)		(7,280)
Income from operations		$ 4,020		$ 7,462