Debt with Commercial Bank (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Sep. 30, 2019	Dec. 31, 2019
Line of Credit Facility [Line Items]
Proceeds from Lines of Credit	$ 0
Deferred Costs, Current	734,000				$ 575,000
Deferred Costs, Noncurrent	1,392,000				1,534,000
Bank Overdrafts	2,746,000				28,352,000
Secured Syndicated Credit Facility, Eighth Amendment [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Deferred Costs, Credit Card Origination Costs, Amount					5,200,000
Secured Syndicated Credit Facility, Eighth Amendment [Member] | Secured Term Loan [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Loans Payable					276,200,000
Loans Payable, Current					20,700,000
Deferred Costs, Credit Card Origination Costs, Amount					2,100,000
Deferred Costs, Current					575,000
Deferred Costs, Noncurrent					1,500,000
Secured Syndicated Credit Facility, Eighth Amendment [Member] | Revolving Credit Facility [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Deferred Costs, Credit Card Origination Costs, Amount					$ 3,100,000
Line of credit, interest rate at period end					4.25%
Credit agreement, average amount outstanding during period		$ 437,200,000
Credit agreement, maximum amount outstanding during period		$ 438,000,000.0
Secured Syndicated Credit Facility, Ninth Amendment [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Deferred Costs, Credit Card Origination Costs, Amount	5,300,000
Secured Syndicated Credit Facility, Ninth Amendment [Member] | Secured Term Loan [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Periodic Payment, Principal	3,800,000
Loans Payable	272,400,000
Loans Payable, Current	22,600,000
Line of Credit Facility, Short Term				12 months
Short-term Debt	22,600,000
Long-term Debt, Gross	249,800,000
Deferred Costs, Credit Card Origination Costs, Amount	2,100,000
Deferred Costs, Current	734,000
Deferred Costs, Noncurrent	1,400,000
Secured Syndicated Credit Facility, Ninth Amendment [Member] | Revolving Credit Facility [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Deferred Costs, Credit Card Origination Costs, Amount	$ 3,200,000
Line of credit, interest rate at period end	4.13%
Credit agreement, average amount outstanding during period	$ 438,000,000.0
Secured Syndicated Credit Facility [Member] | Revolving Credit Facility [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Credit agreement, amount outstanding	$ 438,000,000.0				$ 438,000,000.0
Subsequent Event [Member] | Secured Syndicated Credit Facility, Eighth Amendment [Member] | Secured Term Loan [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Short Term			12 months
India | Minimum [Member] | Bank Overdrafts [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period	6.75%
India | Maximum [Member] | Bank Overdrafts [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period	9.00%