Income Taxes - Net Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Compensation and benefits	$ 39,991	$ 38,445
Depreciation and amortization	3,077	2,883
Unrealized loss on investments	205	2,322
Cumulative translation adjustment	5,266	0
Operating loss carryforwards	3,447	4,310
Capital loss carryforwards	2,845	789
Foreign tax credit carryforwards	4,252	6,206
Other financial accruals	57	168
Valuation allowances	(4,938)	(7,611)
Total deferred tax assets	54,202	47,512
Deferred tax liabilities:
Unrealized gain on investments	0	4,302
Depreciation and amortization	0	125
Cumulative translation adjustment	0	3,726
Intangible asset acquired, net of amortization	0	199
Repatriation of foreign earnings	2,159	545
Other financial accruals	186	348
Total deferred tax liabilities	2,345	9,245
Net deferred tax asset	$ 51,857	$ 38,267