Fair Value Measurements - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Liabilities
Liabilities associated with acquisition related contingent consideration	$ (16,851)	$ (38,266)
Level 1
Liabilities
Liabilities associated with acquisition related contingent consideration	0	0
Level 2
Liabilities
Liabilities associated with acquisition related contingent consideration	0	0
Level 3
Liabilities
Liabilities associated with acquisition related contingent consideration	(16,851)	(38,266)
Interest Rate Derivatives
Assets
Assets associated with interest rate swap and cap contracts	10,638	19,805
Liabilities
Liabilities associated with interest rate swap and cap contracts	(17,420)	(3,290)
Interest Rate Derivatives | Level 1
Assets
Assets associated with interest rate swap and cap contracts	0	0
Liabilities
Liabilities associated with interest rate swap and cap contracts	0	0
Interest Rate Derivatives | Level 2
Assets
Assets associated with interest rate swap and cap contracts	10,638	19,805
Liabilities
Liabilities associated with interest rate swap and cap contracts	(17,420)	(3,290)
Interest Rate Derivatives | Level 3
Assets
Assets associated with interest rate swap and cap contracts	0	0
Liabilities
Liabilities associated with interest rate swap and cap contracts	0	$ 0
Foreign Exchange Forward
Liabilities
Liabilities associated with interest rate swap and cap contracts	(7,868)
Foreign Exchange Forward | Level 1
Liabilities
Liabilities associated with interest rate swap and cap contracts	0
Foreign Exchange Forward | Level 2
Liabilities
Liabilities associated with interest rate swap and cap contracts	(7,868)
Foreign Exchange Forward | Level 3
Liabilities
Liabilities associated with interest rate swap and cap contracts	$ 0