UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 92,137	$ 68,917
Accounts receivable, net	29,806	30,371
Income taxes receivable	0	14,752
Materials and supplies	5,708	8,794
Prepaid expenses and other	5,577	4,279
Deferred income taxes	1,174	1,211
Total current assets	134,402	128,324
Investments, including $2,752 and $2,661 carried at fair value	10,526	10,089
Property, plant and equipment, net	402,877	405,907
Other Assets
Intangible assets, net	67,535	68,260
Deferred charges and other assets, net	6,917	6,662
Other assets, net	74,452	74,922
Total assets	622,257	619,242
Current Liabilities
Current maturities of long-term debt	23,000	23,000
Accounts payable	9,410	11,151
Advanced billings and customer deposits	11,373	12,375
Accrued compensation	3,480	5,466
Income taxes payable	499	0
Accrued liabilities and other	7,926	7,162
Total current liabilities	55,688	59,154
Long-term debt, less current maturities	189,750	201,250
Other Long-Term Liabilities
Deferred income taxes	72,241	76,777
Deferred lease payable	7,686	7,180
Asset retirement obligations	7,522	6,928
Other liabilities	9,653	9,607
Total other long-term liabilities	$ 97,102	$ 100,492
Commitments and Contingencies
Shareholders' Equity
Common stock	$ 30,904	$ 29,712
Accumulated other comprehensive income	541	1,122
Retained earnings	248,272	227,512
Total shareholders' equity	279,717	258,346
Total liabilities and shareholders' equity	$ 622,257	$ 619,242

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.