Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 60,637	$ 61,520
Trade receivables, net of allowance for doubtful accounts of $3,449 and $2,550 (including related parties of $2,652 and $7,357)	70,781	65,072
Prepaid expenses and other current assets (including related parties of $274 and $274)	6,183	4,870
Total current assets	137,601	131,462
Property and equipment, net of accumulated depreciation of $178,680 and $204,343	56,837	55,368
Intangible assets subject to amortization, net of accumulated amortization of $84,553 and $81,770 (including related parties of $10,437 and $11,598)	27,437	13,120
Intangible assets not subject to amortization	220,701	220,701
Goodwill	69,316	50,081
Deferred income taxes	36,558	44,677
Other assets	4,594	2,512
Total assets	553,044	517,921
Current liabilities
Current maturities of long-term debt	3,750	3,750
Accounts payable and accrued expenses (including related parties of $4,114 and $3,886)	47,183	30,810
Total current liabilities	50,933	34,560
Long-term debt, less current maturities, net of unamortized debt issuance costs of $2,034 and $2,365	285,153	286,697
Other long-term liabilities	27,132	13,208
Total liabilities	363,218	334,465
Commitments and contingencies (note 4)
Stockholders' equity
Additional paid-in capital	901,806	904,867
Accumulated deficit	(709,910)	(718,444)
Accumulated other comprehensive income (loss)	(2,080)	(2,977)
Total stockholders' equity	189,826	183,456
Total liabilities and stockholders' equity	553,044	517,921
Class A common stock
Stockholders' equity
Common stock	7	7
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.