Receivables (Installment Receivables by Class) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Total Installment Receivables
Non-Impaired installment receivables with no related allowance recorded	$ 807	$ 818
Impaired installment receivables with a related allowance recorded	4,079	3,894
Total installment receivables	4,886	4,712
Unpaid Principal Balance
Non-Impaired installment receivables with no related allowance recorded	765	778
Impaired installment receivables with a related allowance recorded	4,079	3,894
Total installment receivables	4,844	4,672
Non-Impaired Financing Receivable, Related Allowance	0	0
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	2,661	2,838
Interest Income Recognized
Non-Impaired installment receivables with no related allowance recorded	23	65
Impaired installment receivables with a related allowance recorded	0	0
Total installment receivables	23	65
U.S.
Total Installment Receivables
Impaired installment receivables with a related allowance recorded	3,947	3,762
Unpaid Principal Balance
Impaired installment receivables with a related allowance recorded	3,947	3,762
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	2,529	2,706
Interest Income Recognized
Impaired installment receivables with a related allowance recorded	0	0
CANADA
Total Installment Receivables
Non-Impaired installment receivables with no related allowance recorded	807	818
Impaired installment receivables with a related allowance recorded	132	132
Total installment receivables	939	950
Unpaid Principal Balance
Non-Impaired installment receivables with no related allowance recorded	765	778
Impaired installment receivables with a related allowance recorded	132	132
Total installment receivables	897	910
Non-Impaired Financing Receivable, Related Allowance	0	0
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	132	132
Interest Income Recognized
Non-Impaired installment receivables with no related allowance recorded	23	65
Impaired installment receivables with a related allowance recorded	0	0
Total installment receivables	$ 23	$ 65

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- Definition

Financing Receivable, Recorded Investment

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Financing Receivable, with No Related Allowance, Interest Income, Accrual Method

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Financing Receivable, with No Related Allowance, Recorded Investment

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Financing Receivable, with No Related Allowance, Unpaid Principal Balance

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Impaired Financing Receivable, Related Allowance [Abstract]

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Non-Impaired Financing Receivable, Related Allowance

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Amount of allowance for credit losses related to recorded investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
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-Publisher FASB
-Name Accounting Standards Codification
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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

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-Publisher FASB
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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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