Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable
Billed accounts receivable	$ 134,040us-gaap_BilledContractReceivables	$ 153,011us-gaap_BilledContractReceivables
Unbilled - scheduled billings	22,258us-gaap_UnbilledReceivablesCurrent	29,993us-gaap_UnbilledReceivablesCurrent
Costs and estimated earnings in excess of billings	19,994	8,713
Accounts receivable, gross	176,292us-gaap_AccountsReceivableGrossCurrent	191,717us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts	(2,842)	(2,335)	(1,752)
Accounts receivable, net	173,450us-gaap_AccountsReceivableNetCurrent	189,382us-gaap_AccountsReceivableNetCurrent
Activity in the allowance for doubtful accounts
Balance at beginning of period	2,335	1,752	1,422
Additions Charge to cost and expense	730us-gaap_ProvisionForDoubtfulAccounts	1,813us-gaap_ProvisionForDoubtfulAccounts	825us-gaap_ProvisionForDoubtfulAccounts
Deductions Write-offs	(24)	(1,312)	(580)
Effect of foreign exchange rate changes	(199)	82	85
Balance at end of period	$ 2,842	$ 2,335	$ 1,752

Amount of effect of foreign exchange rate changes on allowance for doubtful accounts.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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- Definition

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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- Definition

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

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer.

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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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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

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