Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the allowance for doubtful accounts and sales allowances
Allowances, at beginning of period	$ 2,184	$ 1,621	$ 2,369
Charged as a reduction of revenue	4,797	6,985	6,898
Charged to bad debt expense in general and administrative expenses	373us-gaap_ProvisionForDoubtfulAccounts	153us-gaap_ProvisionForDoubtfulAccounts	668us-gaap_ProvisionForDoubtfulAccounts
Write-offs, net of recoveries	(5,285)	(6,575)	(8,314)
Allowances, at end of period	2,069	2,184	1,621
Contingent Consideration \| Level 3
Changes in Level 3 financial instruments
Balance at the beginning of period		1,798	428
Changes in fair value		95	1,370
Payments on contingent consideration		(1,893)
Balance at the end of the period			$ 1,798

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Represents the amount of direct write-downs of accounts receivable, net of recoveries, charged against the allowance.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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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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