Basis of Presentation and Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income / Deferred Compensation (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized appreciation on available-for-sale investments	$ 6,529,000				$ 6,529,000				$ 6,866,000
Foreign currency translation	(6,389,000)				(6,389,000)				(6,634,000)
Accumulated other comprehensive income	140,000		285,000		140,000		285,000
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	660,000		(514,000)		232,000		(2,014,000)
Other comprehensive income (loss)	(520,000)		799,000		(92,000)		2,299,000
Ending balance	140,000		285,000		140,000		285,000
Deferred Compensation:
Deferred compensation payable	24,215,000				24,215,000				24,160,000
Deferred compensation expense	(414,000)		589,000		600,000		1,500,000
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred income tax liability on available-for-sale securities	3,500,000				3,500,000				3,700,000
Accumulated Other Comprehensive Income (Loss), Net of Tax
Other comprehensive income (loss) before reclassification	(202,000)		1,089,000		841,000		2,987,000
Amount reclassified and recognized in net loss, net of tax	(565,000)	[1]	(226,000)	[1]	(1,178,000)	[1]	(581,000)	[1]
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred income tax asset on foreign currency translation	3,300,000				3,300,000				3,400,000
Accumulated Other Comprehensive Income (Loss), Net of Tax
Amount reclassified and recognized in net loss, net of tax	$ 247,000		$ (64,000)		$ 245,000		$ (107,000)

[1] Amounts reclassified from unrealized gain on marketable securities are included in other income in the condensed consolidated statement of operations and comprehensive income or loss.