The preliminary fair values of Clark Pest Control's assets and liabilities, at the date of acquisition (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 30, 2019	Dec. 31, 2018
Assets and liabilities:
Goodwill	$ 570,759		$ 368,481
Clark Pest Control [Member]
Assets and liabilities:
Trade accounts receivables		$ 6,974
Materials and supplies		900
Other current assets		5,367
Equipment and property, net		65,535
Goodwill		191,853
Customer contracts		112,700
Trademarks & tradenames		49,300
Non-compete agreements		500
Accounts payable		(1,929)
Accrued compensation and related liabilities		(5,678)
Unearned revenues		(879)
Contingent Consideration, short-term		(6,777)
Other current liabilities		(5,452)
Other long term liabilities		(9,352)
Accrued insurance, less current portion		(1,870)
Contingent Consideration, long-term		(5,923)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 395,269