Fair Value Measurements - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Liabilities
Liabilities associated with acquisition related contingent consideration	$ (9,490)	$ (16,851)
Assets
Assets associated with interest rate swap and cap contracts		10,638
Level 1
Liabilities
Liabilities associated with acquisition related contingent consideration	0	0
Assets
Assets associated with interest rate swap and cap contracts		0
Level 2
Liabilities
Liabilities associated with acquisition related contingent consideration	0	0
Assets
Assets associated with interest rate swap and cap contracts		10,638
Level 3
Liabilities
Liabilities associated with acquisition related contingent consideration	(9,490)	(16,851)
Assets
Assets associated with interest rate swap and cap contracts		0
Interest rate swap and cap contracts
Liabilities
Derivative liabilities	(50,910)	(17,420)
Interest rate swap and cap contracts | Level 1
Liabilities
Derivative liabilities	0	0
Interest rate swap and cap contracts | Level 2
Liabilities
Derivative liabilities	(50,910)	(17,420)
Interest rate swap and cap contracts | Level 3
Liabilities
Derivative liabilities	$ 0	0
Foreign currency forward contracts
Liabilities
Derivative liabilities		(7,868)
Foreign currency forward contracts | Level 1
Liabilities
Derivative liabilities		0
Foreign currency forward contracts | Level 2
Liabilities
Derivative liabilities		(7,868)
Foreign currency forward contracts | Level 3
Liabilities
Derivative liabilities		$ 0