Investments In Enova Investment In Enova (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Nov. 13, 2014
Schedule of Investments [Line Items]
Shares held at beginning				6,475,611
Forfeitures	[1]			0
Shares issued				(33,458)
Withheld				(17,922)
% ownership of Enova						19.40%
Investment Owned, Balance, Shares				6,475,611
Marketable securities unrealized gain (loss)				$ 2,975	$ (14,310)
Gain on disposition of equity securities		$ 6	$ 1,099	123	1,225
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Investments [Line Items]
Marketable securities unrealized gain (loss)				$ 2,975	$ (14,310)
Available-for-sale Securities [Member]
Schedule of Investments [Line Items]
Shares held at beginning	[2]			5,964,106
Forfeitures	[1],[2]			(35,029)
Shares issued	[2]			0
Withheld	[2]			0
Shares held at period end	[2]	5,999,135		5,999,135
% ownership of Enova	[2]					18.10%
Investment Owned, Balance, Shares	[2]	5,999,135		5,964,106		5,999,135
Shares Subject to Nonvested Awards [Member] | Shares Subject to Common Stock Awards [Member]
Schedule of Investments [Line Items]
Shares held at beginning	[3]			511,505
Forfeitures	[1],[3]			(35,029)
Shares issued	[3]			(33,458)
Withheld	[3]			(17,922)
Shares held at period end	[3]	425,096		425,096
% ownership of Enova	[3]					1.28%
Investment Owned, Balance, Shares	[3]	425,096		511,505		425,096
Enova [Member]
Schedule of Investments [Line Items]
Shares held at period end		6,424,231		6,424,231
Investment Owned, Balance, Shares		6,424,231		6,424,231		6,424,231	6,596,927
Enova [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Investments [Line Items]
Marketable securities unrealized gain (loss)				$ 27,600
Enova [Member] | Common Stock [Member]
Schedule of Investments [Line Items]
Investment Owned, at Cost						$ 19,500

[1] 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.

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

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