Fair Value of Assets and Liabilities - Valuation of Financial Assets and Liabilities (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Total assets measured at fair value	$ 68,183	$ 54,015
Liabilities
Total liabilities measured at fair value	30,232	23,064
Acquisition-related contingent consideration obligations-short term
Liabilities
Total liabilities measured at fair value	3,975	4,825
Acquisition-related contingent consideration obligations-long term
Liabilities
Total liabilities measured at fair value	6,850	9,900
Interest Rate Swap Short-term [Member]
Liabilities
Total liabilities measured at fair value	5,872	2,157
Interest Rate Swap Long-term [Member]
Liabilities
Total liabilities measured at fair value	13,535	6,182
Money market accounts
Assets
Total assets measured at fair value	68,183	54,015
Level 1
Assets
Total assets measured at fair value	68,183	54,015
Level 1 | Money market accounts
Assets
Total assets measured at fair value	68,183	54,015
Level 2
Liabilities
Total liabilities measured at fair value	19,407	8,339
Level 2 | Interest Rate Swap Short-term [Member]
Liabilities
Total liabilities measured at fair value	5,872	2,157
Level 2 | Interest Rate Swap Long-term [Member]
Liabilities
Total liabilities measured at fair value	13,535	6,182
Level 3
Liabilities
Total liabilities measured at fair value	10,825	14,725
Level 3 | Acquisition-related contingent consideration obligations-short term
Liabilities
Total liabilities measured at fair value	3,975	4,825
Level 3 | Acquisition-related contingent consideration obligations-long term
Liabilities
Total liabilities measured at fair value	$ 6,850	$ 9,900