UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 65,569	$ 78,585
Accounts receivable, net	58,614	54,184
Income taxes receivable	589	17,311
Inventory, net	6,207	5,704
Prepaid expenses and other	64,163	17,111
Total current assets	195,142	172,895
Investments, including $3,336 and $3,279 carried at fair value	11,949	11,472
Property, plant and equipment, net	668,339	686,327
Other Assets:
Intangible assets, net	396,908	380,979
Goodwill	146,497	146,497
Deferred charges and other assets, net	34,021	13,690
Total assets	1,452,856	1,411,860
Current Liabilities
Current maturities of long-term debt, net of unamortized loan fees	84,631	64,397
Accounts payable	22,674	28,953
Advanced billings and customer deposits	6,668	21,153
Accrued compensation	6,738	9,167
Accrued liabilities and other	18,086	13,914
Total current liabilities	138,797	137,584
Long-term debt, less current maturities, net of unamortized loan fees	715,265	757,561
Other Long-Term Liabilities
Deferred income taxes	111,125	100,879
Deferred lease	19,309	15,782
Asset retirement obligations	21,867	21,211
Retirement plan obligations	13,223	13,328
Other liabilities	15,080	15,293
Total other long-term liabilities	180,604	166,493
Shareholders’ Equity
Common stock, no par value, authorized 96,000 shares; issued and outstanding 49,558 shares in 2018 and 49,328 shares in 2017.	0	0
Additional paid in capital	46,172	44,787
Retained earnings	359,893	297,205
Accumulated other comprehensive income (loss), net of taxes	12,125	8,230
Total shareholders’ equity	418,190	350,222
Total liabilities and shareholders’ equity	$ 1,452,856	$ 1,411,860

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.