Investments In Enova (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)
Schedule of Investments [Line Items]
Gain on disposition of equity securities | $		$ 1,688	$ 0	$ 0
Change in fair value of marketable securities | $		$ (57,117)	$ 71,959	$ (254)
Shares held at beginning		6,596,927
Shares held at period end			6,596,927
Enova [Member]
Schedule of Investments [Line Items]
Shares held at beginning		6,596,927
Forfeitures		0
Shares issued		(90,052)
Withheld		(31,264)
Shares held at period end		6,475,611	6,596,927
% ownership of Enova		0.1962
Enova [Member] | Common Stock [Member]
Schedule of Investments [Line Items]
Investment Owned, at Cost | $		$ 19,600
Change in fair value of marketable securities | $		$ 23,000
Enova [Member] | Marketable securities, net of tax
Schedule of Investments [Line Items]
Shares held at beginning	[1]	5,911,840
Forfeitures	[1],[2]	(52,266)
Shares issued		0
Withheld		0
Shares held at period end	[1]	5,964,106	5,911,840
% ownership of Enova		0.1807
Enova [Member] | Potential Shares to be Delivered Under the LTIPs [Member]
Schedule of Investments [Line Items]
Shares held at beginning	[3]	685,087
Forfeitures	[2],[3]	(52,266)
Shares issued	[3]	(90,052)
Withheld	[3]	(31,264)
Shares held at period end	[3]	511,505	685,087
% ownership of Enova		0.0155

[1] Does not include shares retained for delivery under the LTIPs.

[2] (c) Shares initially allocated for delivery under the LTIPs that were forfeited prior to vesting are attributed to the Company and are to be disposed of by the Company.

[3] The Enova shares payable for vested deferred RSUs and Director Deferred Shares are held in a rabbi trust