UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 59,774	$ 36,193
Accounts receivable, net of allowance of $436 and $449, respectively	65,797	69,789
Income taxes receivable	1,739	0
Inventory, net	13,994	39,043
Prepaid expenses and other	16,765	16,440
Total current assets	158,069	161,465
Investments, including $3,137 and $2,907 carried at fair value	10,849	10,276
Property, plant and equipment, net	679,463	698,122
Other Assets
Intangible assets, net	436,656	454,532
Goodwill	146,497	145,256
Deferred charges and other assets, net	11,465	14,756
Total assets	1,442,999	1,484,407
Current Liabilities
Current maturities of long-term debt, net of unamortized loan fees	44,247	32,041
Accounts payable	22,433	72,810
Advanced billings and customer deposits	20,883	20,427
Accrued compensation	7,100	9,465
Income taxes payable	0	435
Accrued liabilities and other	17,552	29,085
Total current liabilities	112,215	164,263
Long-term debt, less current maturities, net of unamortized loan fees	799,782	797,224
Other Long-Term Liabilities
Deferred income taxes	143,197	151,837
Deferred lease payable	20,303	18,042
Asset retirement obligations	18,367	15,666
Retirement plan obligations	17,973	17,738
Other liabilities	32,499	23,743
Total other long-term liabilities	232,339	227,026
Commitments and Contingencies
Shareholders’ Equity
Common stock	46,766	45,482
Retained earnings	245,885	243,624
Accumulated other comprehensive income, net of taxes	6,012	6,788
Total shareholders’ equity	298,663	295,894
Total liabilities and shareholders’ equity	$ 1,442,999	$ 1,484,407

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.