Debt with Commercial Bank (Narrative) (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020	Sep. 30, 2019	Mar. 30, 2020	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Proceeds from Lines of Credit		$ 1,400,000
Deferred Costs, Current	$ 920,000	920,000					$ 575,000
Deferred Costs, Noncurrent	1,524,000	1,524,000					1,534,000
Bank Overdrafts	7,615,000	7,615,000					28,352,000
Secured Term Loan [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Covenant, net leverage ratio, waiver, maximum						5.0
Covenant, net leverage ratio, waiver						3.50
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	6,100,000	6,100,000
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	5,600,000	9,400,000
Loans Payable	266,800,000	266,800,000
Loans Payable, Current	22,600,000	22,600,000
Line of Credit Facility, Short Term					12 months
Short-term Debt	22,600,000	22,600,000
Long-term Debt, Gross	244,200,000	244,200,000
Deferred Costs, Credit Card Origination Costs, Amount	2,500,000	2,500,000
Deferred Costs, Current	920,000	920,000
Deferred Costs, Noncurrent	1,500,000	1,500,000
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	$ 3,600,000	$ 3,600,000
Line of credit, interest rate at period end	3.50%	3.50%
Credit agreement, average amount outstanding during period		$ 438,500,000
Secured Syndicated Credit Facility [Member] | Revolving Credit Facility [Member] | Regions Bank [Member]
Line of Credit Facility [Line Items]
Credit agreement, amount outstanding	$ 439,400,000	$ 439,400,000					$ 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%