Operating Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Summary of reportable segments
Revenue	$ 71,499	$ 70,260
Direct margin	48,086	46,594
Selling, marketing, administrative and other expenses	(42,518)	(40,009)
Amortization of intangible assets	(559)	(614)
Reorganization costs	(1,591)	(1,343)
Other income and gains/losses on investments	325	468
Income before income taxes	3,743	5,096
BT [Member]
Summary of reportable segments
Revenue	38,875	38,325
Direct margin	27,031	26,207
M&S [Member]
Summary of reportable segments
Revenue	31,782	31,180
Direct margin	21,318	20,680
Events [Member]
Summary of reportable segments
Revenue	842	755
Direct margin	$ (263)	$ (293)

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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