Income Taxes Deferred Portion of Tax Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Amortization of franchise rights	$ 514	$ 514	$ 514
Amortization of other intangibles	1,241	621	1,180
Accrued expenses, deducted for tax when paid	(14,221)	(11,190)	(13,494)
Capitalized costs for books, deducted for tax	8,809	3,019	7,395
Depreciation	(4,147)	(2,597)	(7,813)
Federal impact of unrecognized tax benefits	44	(274)	478
Foreign tax credit carryforwards	(186)	(3,449)	0
Other, net	4,303	97	(3,253)
Deferred Portion Of Tax Expense Benefit, Total	$ (3,643)	$ (13,259)	$ (14,993)