Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Employee compensation and benefit plans	$ 41,447	$ 24,587
Fixed assets and other amortizable assets	79,765	82,882
Reserves	7,875	2,668
Valuation of investments	13,590	32,962
Net operating loss carryforwards and tax credits, net	43,419	94,770
Less: Valuation allowance on net operating loss carryforwards	(9,715)	(15,238)
Total deferred tax assets	176,381	222,631
Deferred tax liabilities:
Fixed assets and other amortizable assets	243	26,244
Reserves	0	2,226
Valuation of investments	280	19,912
Reduction in foreign tax credit for Non-U.S. NOL carryforwards	24,633	19,490
Total deferred tax liabilities	25,156	67,872
Net deferred tax assets	$ 151,225	$ 154,759