Organization and Business (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment	1
Revenues	$ 251,784	$ 245,877
Long-Lived Assets	$ 126,537	125,013
Warranty period for international agreements	24 months
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 153,335	167,576
Long-Lived Assets	115,053	110,643
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	36,340	29,756
Long-Lived Assets	3,076	3,993
Outside the United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	62,109	48,545
Long-Lived Assets	$ 8,408	$ 10,377
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