Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 86,470	$ 6,198
Restricted cash	5,457	7,901
Accounts receivable, net of allowance for doubtful accounts of $5,362 and $4,975, respectively	219,433	261,400
Related party receivables	906	716
Inventories, net	17,268	19,047
Prepaid expenses and other current assets	33,695	23,663
Total current assets	363,229	318,925
Property, plant and equipment, net of accumulated depreciation of $187,260 and $176,995, respectively	100,878	113,637
Operating lease right-of-use assets, net	90,067	93,627
Goodwill	359,009	359,771
Intangible assets, net	317,630	342,443
Deferred income tax assets	11,769	12,032
Other noncurrent assets	25,961	17,889
Total assets	1,268,543	1,258,324
Current liabilities
Accounts payables	67,385	86,167
Related party payables	2	1,740
Income tax payable	2,333	352
Accrued liabilities	116,376	121,553
Accrued compensation and benefits	52,636	48,574
Accrued interest	48,127	48,769
Customer deposits	27,301	27,765
Deferred revenue	19,179	16,282
Obligation for claim payment	34,801	39,156
Current portion of finance lease liabilities	12,831	13,788
Current portion of operating lease liabilities	24,271	25,345
Current portion of long-term debts	36,101	36,490
Total current liabilities	441,343	465,981
Long-term debt, net of current maturities	1,493,775	1,398,385
Finance lease liabilities, net of current portion	14,437	20,272
Pension liabilities	23,881	25,681
Deferred income tax liabilities	7,685	7,996
Long-term income tax liabilities	2,808	2,806
Operating lease liabilities, net of current portion	71,661	73,282
Other long-term liabilities	12,807	6,962
Total liabilities	2,068,397	2,001,365
Commitments and Contingencies (Note 8)
Stockholders' equity (deficit)
Common stock, par value of $0.0001 per share; 1,600,000,000 shares authorized; 154,866,550 shares issued and 147,511,430 shares outstanding at June 30, 2020 and 153,638,836 shares issued and 150,851,689 shares outstanding at December 31, 2019	15	15
Preferred stock, par value of $0.0001 per share; 20,000,000 shares authorized; 3,290,050 shares issued and outstanding at June 30, 2020 and 4,294,233 shares issued and outstanding at December 31, 2019	1	1
Additional paid in capital	446,739	445,452
Less: Common Stock held in treasury, at cost; 7,355,120 shares at June 30, 2020 and 2,787,147 shares at December 31, 2019	(10,949)	(10,949)
Equity-based compensation	51,118	49,336
Accumulated deficit	(1,272,869)	(1,211,508)
Accumulated other comprehensive loss:
Foreign currency translation adjustment	(6,387)	(7,329)
Unrealized pension actuarial losses, net of tax	(7,522)	(8,059)
Total accumulated other comprehensive loss	(13,909)	(15,388)
Total stockholders' deficit	(799,854)	(743,041)
Total liabilities and stockholders' deficit	$ 1,268,543	$ 1,258,324