Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 55,980	$ 61,520
Restricted cash	231,096
Trade receivables, net of allowance for doubtful accounts of $3,474 and $2,550 (including related parties of $3,973 and $7,357)	72,651	65,072
Prepaid expenses and other current assets (including related parties of $274 and $274)	6,583	4,870
Total current assets	366,310	131,462
Property and equipment, net of accumulated depreciation of $178,237 and $204,343	56,606	55,368
Intangible assets subject to amortization, net of accumulated amortization of $86,300 and $81,770 (including related parties of $9,857 and $11,598)	25,691	13,120
Intangible assets not subject to amortization	241,298	220,701
Goodwill	69,042	50,081
Deferred income taxes		44,677
Other assets	5,474	2,512
Total assets	764,421	517,921
Current liabilities
Current maturities of long-term debt	3,750	3,750
Accounts payable and accrued expenses (including related parties of $3,780 and $3,886)	49,117	30,810
Total current liabilities	52,867	34,560
Long-term debt, less current maturities, net of unamortized debt issuance costs of $2,252 and $2,365	283,998	286,697
Other long-term liabilities	26,083	13,208
Deferred income taxes	59,720
Total liabilities	422,668	334,465
Commitments and contingencies (note 4)
Stockholders' equity
Additional paid-in capital	896,070	904,867
Accumulated deficit	(552,702)	(718,444)
Accumulated other comprehensive income (loss)	(1,625)	(2,977)
Total stockholders' equity	341,753	183,456
Total liabilities and stockholders' equity	764,421	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.