Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 9,006	$ 21,197	$ 114,784	$ 9,651
Other comprehensive (loss) income, net of tax:
Gross unrealized (losses) gains on available for sale securities, net of tax		(10,784)	7,785	16,277	13,564
Reclassification of unrealized losses (gains), net of tax	[1]	5,054	(396)	(17,609)	(1,664)
Gross unrealized (losses) gains on available for sale securities, net of tax and reclassifications		(5,730)	7,389	(1,332)	11,900
Gross unrealized gain on derivative financial instruments		11	0	11	0
Currency translation adjustment		1,467	229	(167)	(23)
Change in pension liability and other post-retirement benefit obligations, net of tax		0	0	1,627	0
Other comprehensive (loss) income		(4,252)	7,618	139	11,877
Comprehensive income		4,754	28,815	114,923	21,528
Comprehensive income attributable to non-controlling interests		(4,483)	(12,254)	(34,121)	(15,099)
Comprehensive income attributable to common unit holders		271	16,561	80,802	6,429
Tax provision (benefit) on gross unrealized gains and losses on available-for-sale securities		1,159	1,271	(1,817)	4,035
Tax provision (benefit) on reclassification of unrealized gains and losses on available-for-sale securities		6,809	(196)	6,718	(862)
Tax provision on change in pension and other post-retirement benefit obligations		$ 0	$ 0	$ 395	$ 0

[1] For the three months ended June 30, 2015 and 2014 unrealized holding losses of $12,239 and gains of $309, respectively, were reclassified to Other income, net and gains of $7,185 and $87, respectively, were reclassified to Net investment gains (losses). For the six months ended June 30, 2015 and 2014 unrealized holding losses of $12,054 and gains of $1,577, respectively, were reclassified to Other income, net and gains of $29,663 and 87, respectively, were reclassified to Net investment gains (losses).