UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 77,152	$ 68,917
Accounts receivable, net	28,277	30,371
Income taxes receivable	5,433	14,752
Materials and supplies	10,261	8,794
Prepaid expenses and other	5,998	4,279
Deferred income taxes	1,087	1,211
Total current assets	128,208	128,324
Investments, including $2,727 and $2,661 carried at fair value	10,329	10,089
Property, plant and equipment, net	402,174	405,907
Other Assets
Intangible assets, net	67,939	68,260
Deferred charges and other assets, net	6,856	6,662
Other assets, net	74,795	74,922
Total assets	615,506	619,242
Current Liabilities
Current maturities of long-term debt	23,000	23,000
Accounts payable	7,524	11,151
Advanced billings and customer deposits	11,510	12,375
Accrued compensation	3,017	5,466
Accrued liabilities and other	8,181	7,162
Total current liabilities	53,232	59,154
Long-term debt, less current maturities	195,500	201,250
Other Long-Term Liabilities
Deferred income taxes	74,075	76,777
Deferred lease payable	7,429	7,180
Asset retirement obligations	7,256	6,928
Other liabilities	9,694	9,607
Total other long-term liabilities	98,454	100,492
Commitments and Contingencies
Shareholders' Equity
Common stock	30,307	29,712
Accumulated other comprehensive income	215	1,122
Retained earnings	237,798	227,512
Total shareholders' equity	268,320	258,346
Total liabilities and shareholders' equity	$ 615,506	$ 619,242