Office Equipment and Leasehold Improvements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Office equipment and leasehold improvements
Total	$ 11,135	$ 10,677
Less: accumulated depreciation and amortization	(5,824)	(3,942)
Total office equipment and leasehold improvements, net	5,311	6,735
Depreciation and amortization expense	1,882	1,936	1,624
Communications and data processing equipment
Office equipment and leasehold improvements
Total	5,149	4,968
Furniture and fixtures
Office equipment and leasehold improvements
Total	3,334	3,251
Leasehold improvements
Office equipment and leasehold improvements
Total	1,802	1,766
Software
Office equipment and leasehold improvements
Total	$ 850	$ 692

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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