Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of total provision for income taxes
Income from continuing operations before income taxes	$ 85,889	$ 94,343	$ 190,225
Pre-tax income attributable to pass-through subsidiaries	(96,314)	(94,755)	(111,664)
Pre-tax (loss) income attributable to taxable subsidiaries	(10,425)	(412)	78,561
Federal provision at statutory tax rate (35%)	(3,649)	(144)	27,496
State and local taxes, net of federal benefit	(166)	616	7,409
Amortization of intangible assets	492	465	486
Other	(302)	1,069	272
Tax provision - taxable subsidiaries	(3,625)	2,006	35,663
Current foreign taxes	7,144	3,138	1,480
Deferred foreign taxes	(2,442)	0	0
Other state and local taxes	175	1,628	71
Income tax expense from continuing operations	$ 1,252	$ 6,772	$ 37,214
Effective Income Tax Rate Reconciliation, Percent
Income tax rate - federal	35.00%	35.00%	35.00%
Income tax rate - state and local	1.60%	149.50%	9.40%
Income tax rate - amortization of intangible assets	4.70%	112.90%	0.60%
Income tax rate - other	2.90%	261.20%	0.40%
Income tax rate - total	34.80%	488.60%	45.40%