Organization, Consolidation and Presentation of Financial Statements - Property, Plant, and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Property Plant And Equipment [Abstract]
Data processing equipment and software	$ 50,956	[1]	$ 59,237
Leasehold improvements	13,910	[1]	19,090
Other, principally furniture and equipment	26,763	[1]	34,783
Total property, plant and equipment, Gross	91,629	[1]	113,110
Accumulated depreciation	(65,166)	[1]	(88,060)
Net property and equipment	$ 26,463	[1]	$ 25,050

[1] In 2014, property and equipment with no remaining net book value was disposed of in connection with asset maintenance activities and the move of our corporate headquarters. The gross carrying amount of assets and accumulated depreciation written off were each $28.9 million.