Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 61,520	$ 47,924
Trade receivables, net of allowance for doubtful accounts of $2,550 and $3,040 (including related parties of $7,357 and $5,534)	65,072	66,399
Prepaid expenses and other current assets (including related parties of $274 and $274)	4,870	5,705
Total current assets	131,462	120,028
Property and equipment, net of accumulated depreciation of $204,343 and $198,282	55,368	57,874
Intangible assets subject to amortization, net of accumulated amortization of $81,770 and $78,234 (including related parties of $11,598 and $13,918)	13,120	16,656
Intangible assets not subject to amortization	220,701	220,701
Goodwill	50,081	50,081
Deferred income taxes	44,677	57,929
Other assets	2,512	1,693
Total assets	517,921	524,962
Current liabilities
Current maturities of long-term debt	3,750	3,750
Accounts payable and accrued expenses (including related parties of $3,886 and $3,909)	30,810	29,787
Total current liabilities	34,560	33,537
Long-term debt, less current maturities, net of unamortized debt issuance costs of $2,365 and $3,226	286,697	309,587
Other long-term liabilities	13,208	14,565
Total liabilities	334,465	357,689
Commitments and contingencies (note 11)
Stockholders' equity
Additional paid-in capital	904,867	910,228
Accumulated deficit	(718,444)	(738,849)
Accumulated other comprehensive income (loss)	(2,977)	(4,115)
Total stockholders' equity	183,456	167,273
Total liabilities and stockholders' equity	517,921	524,962
Class A common stock
Stockholders' equity
Common stock	7	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.