Convertible Debt and Notes Payable - Term Loans, Other Notes Payable and Revolver (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jul. 01, 2019	Jun. 30, 2017
Debt and Capital Lease Obligations [Line Items]
Letter of credit, borrowing capacity	$ 300,000,000
Other Notes Payable	$ 4,719,000		$ 2,516,000
Notes Payable to Banks
Debt and Capital Lease Obligations [Line Items]
Debt Instrument, Face Amount				$ 4,000,000.0	$ 28,200,000
Short-term Debt, Percentage Bearing Variable Interest Rate	3.75%
Interest Expense, Debt, Excluding Amortization	$ 400,000	$ 400,000
Insurance Note
Debt and Capital Lease Obligations [Line Items]
Interest rate	2.01%
Debt Instrument, Periodic Payment, Principal	$ 300,000
Insurance Note
Debt and Capital Lease Obligations [Line Items]
Short-term Debt, Maximum Amount Outstanding During Period	2,900,000
Other Notes Payable	2,300,000
Revolving Credit Facility
Debt and Capital Lease Obligations [Line Items]
Line of Credit, Current	25,000,000		$ 0
Revolving Credit Facility | BMO Harris Bank
Debt and Capital Lease Obligations [Line Items]
Letter of credit, borrowing capacity	$ 25,000,000
Corporate Debt
Debt and Capital Lease Obligations [Line Items]
Interest rate	6.00%
Debt Instrument, Periodic Payment, Principal	$ 100,000
Borrowings on other long term debt	2,600,000
Other Long-term Debt	2,400,000
Spike Line
Debt and Capital Lease Obligations [Line Items]
Interest Expense, Debt, Excluding Amortization	100,000
Line of Credit, Current	35,000,000
Revolving Credit Facility
Debt and Capital Lease Obligations [Line Items]
Interest Expense, Debt, Excluding Amortization	200,000
Line of Credit, Current	25,000,000
Maximum | Spike Line
Debt and Capital Lease Obligations [Line Items]
Line of Credit, Current	$ 70,000,000