Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$ 713,848	$ 680,153	$ 646,034
Costs and expenses:
Operating	462,646	437,332	426,626
Selling	120,842	111,578	104,871
General and administrative	50,654	48,171	42,793
Depreciation	38,231	37,365	37,818
Amortization of intangible assets	1,980	1,742	1,908
Gain on sale of assets, net	(1,294)	(1,802)	(783)
Costs and Expenses	673,059	634,386	613,233
Income from operations	40,789	45,767	32,801
Other income (expense):
Interest expense	(2,708)	(2,698)	(3,794)
Interest income	311	200	43
Litigation settlement	0	0	(2,900)
Other	(2,827)	(2,611)	(2,850)
Income before income taxes	35,565	40,658	23,300
Income taxes	12,712	16,063	9,235
Net income	$ 22,853	$ 24,595	$ 14,065
Share data:
Earnings per share--basic:	$ 1.61	$ 1.74	$ 1.00
Earnings per share--diluted:	$ 1.57	$ 1.68	$ 0.97
Weighted-average shares outstanding:
Basic	14,170,681	14,102,366	14,006,093
Diluted	14,602,432	14,608,857	14,536,872
Dividends declared per share	$ 0.18	$ 0.18	$ 0.17