Debt (Textual) (Details) - USD ($)			12 Months Ended
	Nov. 14, 2019	Jan. 11, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Maximum amount borrowed			$ 1,507,800,000
Unused capacity			$ 1,281,400,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time			3.24%			3.32%
Current line of credit			$ 147,031,000			$ 205,000,000
Debt instrument term			15 years
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 73,000,000
Recourse
Debt Instrument [Line Items]
Aggregate annual maturities of long term debt, 2019			$ 53,400,000
Aggregate annual maturities of long term debt, 2020			66,600,000
Aggregate annual maturities of long term debt, 2021			49,900,000
Aggregate annual maturities of long term debt, 2022			58,600,000
Aggregate annual maturities of long term debt, 2023			135,400,000
Aggregate annual maturities of long term debt thereafter			383,300,000
Non-recourse
Debt Instrument [Line Items]
Unused capacity			130,800,000
Maximum borrowing capacity			184,800,000
Aggregate annual maturities of long term debt, 2019			9,500,000
Aggregate annual maturities of long term debt, 2020			188,100,000
Aggregate annual maturities of long term debt, 2021			22,000,000.0
Aggregate annual maturities of long term debt, 2022			19,000,000.0
Aggregate annual maturities of long term debt, 2023			12,100,000
Aggregate annual maturities of long term debt thereafter			$ 89,900,000
Fixed rate long-term notes payable
Debt Instrument [Line Items]
Interest rate of debt instruments	4.50%
Debt instrument term	15 years
Debt Instrument, Face Amount	$ 105,000,000			$ 70,000,000
Line of credit, 3.76%, payable at maturity, due 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 130,000,000
Line of credit, 3.76%, payable at maturity, due 2021 | Non-recourse
Debt Instrument [Line Items]
Interest rate of debt instruments			3.76%
Lansing Trade Group, LLC (b) | London Interbank Offered Rate (LIBOR) [Member] | Term Loan
Debt Instrument [Line Items]
Long-term Debt			$ 15,500,000
Interest rate of debt instruments			4.51%
Lansing Trade Group, LLC (b) | London Interbank Offered Rate (LIBOR) [Member] | Fixed rate long-term notes payable | 5-year Term Loan
Debt Instrument [Line Items]
Interest rate of debt instruments					3.13%
Debt instrument term		5 years	5 years
Debt Instrument, Face Amount		$ 250,000,000
Lansing Trade Group, LLC (b) | London Interbank Offered Rate (LIBOR) [Member] | Fixed rate long-term notes payable | 7-year Term Loan
Debt Instrument [Line Items]
Interest rate of debt instruments					3.38%
Debt instrument term		7 years	7 years
Debt Instrument, Face Amount		$ 250,000,000