Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 39,560	$ 61,520
Restricted cash	222,294
Trade receivables (including related parties of $4,653 and $7,357), net of allowance for doubtful accounts of $2,566 and $2,550	84,348	65,072
Prepaid expenses and other current assets (including related parties of $274 and $274)	6,260	4,870
Total current assets	352,462	131,462
Property and equipment, net of accumulated depreciation of $179,869 and $204,343	60,337	55,368
Intangible assets subject to amortization, net of accumulated amortization of $87,632 and $81,770 (including related parties of $9,555 and $11,598)	26,758	13,120
Intangible assets not subject to amortization	251,163	220,701
Goodwill	70,557	50,081
Deferred income taxes		44,677
Other assets	4,690	2,512
Total assets	765,967	517,921
Current liabilities
Current maturities of long-term debt	3,000	3,750
Accounts payable and accrued expenses (including related parties of $2,548 and $3,886)	59,522	30,810
Total current liabilities	62,522	34,560
Long-term debt, less current maturities, net of unamortized debt issuance costs of $3,761 and $2,365	292,489	286,697
Other long-term liabilities	21,447	13,208
Deferred income taxes	40,639
Total liabilities	417,097	334,465
Commitments and contingencies (note 12)
Stockholders' equity
Additional paid-in capital	888,650	904,867
Accumulated deficit	(539,730)	(718,444)
Accumulated other comprehensive income (loss)	(60)	(2,977)
Total stockholders' equity	348,870	183,456
Total liabilities and stockholders' equity	765,967	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.