Receivables (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	$ 9,381	$ 8,919
Installment Receivables, Net of Unearned Interest	9,321	8,858
Allowance for doubtful accounts	(6,221)	(6,039)
Installment receivables, net	1,590	1,562
Installment receivables, net, long-term	1,510	1,257
Installment Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Installment Receivables, Current	3,217	3,242
Installment Receivables, Long-Term	6,164	5,677
Total Installment Receivables	9,381	8,919
Unearned Interest, Current	(60)	(61)
Unearned Interest, Noncurrent	0	0
Total Unearned Interest	(60)	(61)
Installment Receivables Net of Unearned Interest Current	3,157	3,181
Installment Receivables Net of Unearned Interest Noncurrent	6,164	5,677
Installment Receivables, Net of Unearned Interest	9,321	8,858
Allowance for doubtful accounts, current	(1,567)	(1,619)
Allowance for doubtful accounts, long-term	(4,654)	(4,420)
Allowance for doubtful accounts	(6,221)	(6,039)	(3,823)
Installment receivables, net	1,590	1,562
Installment receivables, net, long-term	1,510	1,257
Installment receivables, net	$ 3,100	$ 2,819

Notes, Loans and Financing Receivable, Net of Unearned Interest

No definition available.

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- Definition

Notes Loans and Financing Receivable Net of Unearned Interest Current

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No definition available.

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- Definition

Notes Loans and Financing Receivable Net of Unearned Interest Noncurrent

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No definition available.

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

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-Subparagraph (SX 210.5-02.4)

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

+ References

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Section A

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-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

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-Publisher FASB

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-Topic 310

-SubTopic 10

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-Paragraph 11B

-Subparagraph (c)(1)

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- Definition

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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