UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 67,095	$ 71,086
Accounts receivable, net	24,566	25,274
Income taxes receivable	2,239	4,705
Materials and supplies	7,186	9,789
Prepaid expenses and other	5,790	4,749
Deferred income taxes	942	832
Total current assets	107,818	116,435
Investments, including $2,173 and $2,064 carried at fair value	8,448	8,214
Property, plant and equipment, net	370,196	365,474
Other Assets
Intangible assets, net	73,783	74,942
Deferred charges and other assets, net	6,483	5,675
Net other assets	80,266	80,617
Total assets	566,728	570,740
Current Liabilities
Current maturities of long-term debt	1,238	1,977
Accounts payable	20,500	31,729
Advanced billings and customer deposits	11,191	11,190
Accrued compensation	2,277	2,671
Accrued liabilities and other	9,597	10,573
Total current liabilities	44,803	58,140
Long-term debt, less current maturities	230,200	230,200
Other Long-Term Liabilities
Deferred income taxes	56,952	57,896
Deferred lease payable	5,221	4,903
Asset retirement obligations	5,966	5,896
Other liabilities	6,570	5,857
Total other liabilities	74,709	74,552
Commitments and Contingencies
Shareholders' Equity
Common stock	24,973	24,688
Accumulated other comprehensive loss	(331)	(863)
Retained earnings	192,374	184,023
Total shareholders' equity	217,016	207,848
Total liabilities and shareholders' equity	$ 566,728	$ 570,740