Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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- Definition

Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of property and equipment
Property and equipment, at cost	$ 185,229us-gaap_PropertyPlantAndEquipmentGross	$ 183,746us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(92,925)	(111,108)
Property and equipment, net	92,304us-gaap_PropertyPlantAndEquipmentNet	72,638us-gaap_PropertyPlantAndEquipmentNet
Depreciation	14,634us-gaap_DepreciationNonproduction	12,834us-gaap_DepreciationNonproduction	13,211us-gaap_DepreciationNonproduction
Leasehold improvements
Summary of property and equipment
Property and equipment, at cost	21,039	19,991
Leasehold improvements \| Minimum
Summary of property and equipment
Estimated useful lives	1 year
Leasehold improvements \| Maximum
Summary of property and equipment
Estimated useful lives	15 years
Furniture and fixtures
Summary of property and equipment
Property and equipment, at cost	29,462	32,688
Furniture and fixtures \| Minimum
Summary of property and equipment
Estimated useful lives	3 years
Furniture and fixtures \| Maximum
Summary of property and equipment
Estimated useful lives	10 years
Equipment
Summary of property and equipment
Property and equipment, at cost	20,829	19,984
Equipment \| Minimum
Summary of property and equipment
Estimated useful lives	3 years
Equipment \| Maximum
Summary of property and equipment
Estimated useful lives	26 years
Computer software
Summary of property and equipment
Property and equipment, at cost	74,506	80,692
Computer software \| Minimum
Summary of property and equipment
Estimated useful lives	1 year
Computer software \| Maximum
Summary of property and equipment
Estimated useful lives	10 years
Data processing equipment
Summary of property and equipment
Property and equipment, at cost	23,684	22,374
Data processing equipment \| Minimum
Summary of property and equipment
Estimated useful lives	1 year
Data processing equipment \| Maximum
Summary of property and equipment
Estimated useful lives	5 years
Buildings
Summary of property and equipment
Property and equipment, at cost	11,905	6,077
Buildings \| Minimum
Summary of property and equipment
Estimated useful lives	1 year
Buildings \| Maximum
Summary of property and equipment
Estimated useful lives	40 years
Land
Summary of property and equipment
Property and equipment, at cost	3,804	1,940
Property and equipment under capital leases
Summary of property and equipment
Property and equipment, at cost	2,000	1,900
Accumulated depreciation	$ 900	$ 900