Due to Shareholders of Acquired Companies - Schedule of Aggregate Maturities of due to Shareholders of Acquired Companies (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Aggregate maturities	$ 2,783,692	$ 3,200,565
Related Party Notes Payable
Debt Instrument [Line Items]
2019	24,488
2020	12,242
2021	11,101
2022	0
2023	0
Aggregate maturities	47,831
Less: imputed interest discount	(2,440)
Total	$ 45,391

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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