CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 76,812	$ 68,917
Accounts receivable, net	29,778	30,371
Income taxes receivable	7,694	14,752
Materials and supplies	4,183	8,794
Prepaid expenses and other	8,573	4,279
Deferred income taxes	907	1,211
Total current assets	127,947	128,324
Investments, including $2,654 and $2,661 carried at fair value	10,679	10,089
Property, plant and equipment, net	410,018	405,907
Other Assets
Intangible assets, net	66,993	68,260
Deferred charges and other assets, net	13,103	6,662
Other assets, net	80,096	74,922
Total assets	628,740	619,242
Current Liabilities
Current maturities of long-term debt	23,000	23,000
Accounts payable	13,009	11,151
Advanced billings and customer deposits	11,674	12,375
Accrued compensation	5,915	5,466
Accrued liabilities and other	7,639	7,162
Total current liabilities	61,237	59,154
Long-term debt, less current maturities	178,250	201,250
Other Long-Term Liabilities
Deferred income taxes	74,868	76,777
Deferred lease payable	8,142	7,180
Asset retirement obligations	7,266	6,928
Other liabilities	9,039	9,607
Total other liabilities	$ 99,315	$ 100,492
Commitments and Contingencies
Shareholders' Equity
Common stock, no par value, authorized 96,000 shares; issued and outstanding 48,475 shares in 2015 and 48,265 shares in 2014	$ 32,776	$ 29,712
Accumulated other comprehensive income, net of taxes	415	1,122
Retained earnings	256,747	227,512
Total shareholders' equity	289,938	258,346
Total liabilities and shareholders' equity	$ 628,740	$ 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.