Organization and Business (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment			1
Revenues	$ 271,910	$ 252,057	$ 523,694	$ 497,934
Long-Lived Assets	117,498	124,301	$ 117,498	124,301
Warranty period for international agreements			24 months
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	192,293	167,923	$ 345,628	335,499
Long-Lived Assets	105,996	110,323	105,996	110,323
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,041	28,292	64,381	58,048
Long-Lived Assets	2,755	3,917	2,755	3,917
Outside the United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	51,576	55,842	113,685	104,387
Long-Lived Assets	$ 8,747	$ 10,061	$ 8,747	$ 10,061
Minimum
Revenues from External Customers and Long-Lived Assets [Line Items]
Warranty period			90 days
Maximum
Revenues from External Customers and Long-Lived Assets [Line Items]
Warranty period			180 days