UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 89,160	$ 76,812
Accounts receivable, net	27,012	29,778
Income taxes receivable	712	7,694
Materials and supplies	4,450	4,183
Prepaid expenses and other	7,623	8,573
Deferred income taxes	0	907
Total current assets	128,957	127,947
Investments, including $2,706 and $2,654 carried at fair value	10,860	10,679
Property, plant and equipment, net	410,949	410,018
Other Assets
Intangible assets, net	67,283	66,993
Deferred charges and other assets, net	11,323	11,514
Other assets, net	78,606	78,507
Total assets	629,372	627,151
Current Liabilities
Current maturities of long-term debt, net of unamortized loan fees	22,508	22,492
Accounts payable	10,720	13,009
Advanced billings and customer deposits	11,981	11,674
Accrued compensation	2,037	5,915
Accrued liabilities and other	7,767	7,639
Total current liabilities	55,013	60,729
Long-term debt, less current maturities, net of unamortized loan fees	171,535	177,169
Other Long-Term Liabilities
Deferred income taxes	71,767	74,868
Deferred lease payable	8,349	8,142
Asset retirement obligations	7,412	7,266
Other liabilities	12,027	9,039
Total other long-term liabilities	$ 99,555	$ 99,315
Commitments and Contingencies
Shareholders' Equity
Common stock	$ 33,274	$ 32,776
Accumulated other comprehensive income (loss), net of taxes	(633)	415
Retained earnings	270,628	256,747
Total shareholders' equity	303,269	289,938
Total liabilities and shareholders' equity	$ 629,372	$ 627,151

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.