Receivables and Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Line Items]
Receivable, gross	$ 69,515us-gaap_AccountsReceivableGross	$ 62,878us-gaap_AccountsReceivableGross
Receivables, net	65,492us-gaap_AccountsReceivableNet	59,178us-gaap_AccountsReceivableNet
Changes in Allowance for Doubtful Accounts (Table Details) [Abstract]
Beginning balance	(3,700)	(2,920)	(3,919)
Bad debt expense	15,509us-gaap_ProvisionForDoubtfulAccounts	14,589us-gaap_ProvisionForDoubtfulAccounts	12,953us-gaap_ProvisionForDoubtfulAccounts
Allowance for Doubtful Accounts Receivable, Write-offs	15,718	14,271	14,337
Allowance for Doubtful Accounts Receivable, Recoveries	532	462	385
Ending balance	(4,023)	(3,700)	(2,920)
Installment Sales Receivable [Member]
Receivables [Line Items]
Receivable, gross	56,516	51,335
Changes in Allowance for Doubtful Accounts (Table Details) [Abstract]
Ending balance	(3,509)	(2,932)
Trade and Notes Receivables [Member]
Receivables [Line Items]
Receivable, gross	12,999	11,543
Changes in Allowance for Doubtful Accounts (Table Details) [Abstract]
Ending balance	$ (514)	$ (768)

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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