Income Taxes Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets [Abstract]
Deferred compensation plans	$ 14,271	$ 12,022
Deferred income	6,328	8,396
Allowance for uncollectible receivables	1,295	281
Deferred liabilities	3,574	4,239
Deferred Tax Assets, Operating Loss Carryforwards	19,186	20,749
Deferred tax assets	44,654	45,687
Valuation allowance	(1,213)	(1,334)
Net deferred tax asset	43,441	44,353
Deferred Tax Liabilities, Gross [Abstract]
Intangible assets in excess of tax basis	22,749	18,725
Property and equipment in excess of tax basis	40,135	40,175
Other	2,246	1,874
Deferred tax liabilities	65,130	60,774
Net deferred tax asset (liability)	(21,689)	(16,421)
Deferred income taxes	8,927	8,227
Net non-current deferred tax liability	$ (30,616)	$ (24,648)