Fair Value Measurements (Fair Value Assets(Liabilities) Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonqualified Savings Plan-related assets and Director Deferred Shares	[1]	$ 11,679	$ 10,767	$ 11,576
Investment in equity securities		47,069	42,613	109,140
Total		58,748	53,380	120,716
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonqualified Savings Plan-related assets and Director Deferred Shares	[1]	11,679	10,767	11,090
Investment in equity securities		47,069	42,613	0
Total		58,748	53,380	11,090
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonqualified Savings Plan-related assets and Director Deferred Shares	[1]	0	0	486
Investment in equity securities		0	0	109,140
Total		0	0	109,626
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonqualified Savings Plan-related assets and Director Deferred Shares	[1]	0	0	0
Investment in equity securities		0	0	0
Total		$ 0	$ 0	$ 0

[1] Only includes the portion of the Director Deferred Shares that are payable in Enova common stock.