Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 50,866	$ 31,260
Trade receivables, net of allowance for doubtful accounts of $2,875 and $3,100 (including related parties of $4,965 and $10,882)	56,232	64,956
Deferred income taxes	5,900	5,900
Prepaid expenses and other current assets (including related parties of $274 and $274)	5,350	5,295
Total current assets	118,348	107,411
Property and equipment, net of accumulated depreciation of $198,726 and $193,532	60,365	56,784
Intangible assets subject to amortization, net of accumulated amortization of $76,465 and $74,697 (including related parties of $15,078 and $16,239)	18,424	20,193
Intangible assets not subject to amortization	220,701	220,701
Goodwill	50,081	50,081
Deferred income taxes	60,934	66,558
Other assets	5,581	6,039
Total assets	534,434	527,767
Current liabilities
Current maturities of long-term debt	3,750	3,750
Advances payable, related parties	118	118
Accounts payable and accrued expenses (including related parties of $3,810 and $3,695)	28,275	32,195
Total current liabilities	32,143	36,063
Long-term debt, less current maturities	334,688	336,563
Other long-term liabilities	13,716	9,583
Total liabilities	$ 380,547	$ 382,209
Commitments and contingencies (note 4)
Stockholders' equity
Additional paid-in capital	$ 911,161	$ 912,161
Accumulated deficit	(753,949)	(764,474)
Accumulated other comprehensive income (loss)	(3,334)	(2,138)
Total stockholders' equity	153,887	145,558
Total liabilities and stockholders' equity	534,434	527,767
Class A common stock
Stockholders' equity
Common stock	6	6
Class B common stock
Stockholders' equity
Common stock	2	2
Class U common stock
Stockholders' equity
Common stock	$ 1	$ 1

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- 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.