Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 40,428	$ 51,370
Accounts and notes receivable, net of allowance for doubtful accounts of $3,128 and $2,001 as of September 30, 2018 and December 31, 2017, respectively	87,150	105,245
Inventory, net	15,317	14,283
Restricted cash	73,870	48,328
Prepaid expenses, deferred costs, and other current assets	106,497	96,106
Total current assets	323,262	315,332
Property and equipment, net of accumulated depreciation of $404,549 and $404,141 as of September 30, 2018 and December 31, 2017, respectively	457,350	497,902
Intangible assets, net	164,480	209,862
Goodwill	759,191	774,939
Deferred tax asset, net	7,412	6,925
Prepaid expenses, deferred costs, and other noncurrent assets	72,386	57,756
Total assets	1,784,081	1,862,716
Current liabilities:
Current portion of other long-term liabilities	19,690	31,370
Accounts payable	41,848	44,235
Accrued liabilities	310,754	306,945
Total current liabilities	372,292	382,550
Long-term liabilities:
Long-term debt	835,790	917,721
Asset retirement obligations	55,705	59,920
Deferred tax liability, net	48,812	37,130
Other long-term liabilities	59,744	75,002
Total liabilities	1,372,343	1,472,323
Commitments and contingencies (See Note 14)
Shareholders' equity:
Ordinary shares, $0.01 nominal value; 46,105,014 and 45,696,338 issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	461	457
Additional paid-in capital	322,323	316,940
Accumulated other comprehensive loss, net	(33,336)	(33,595)
Retained earnings	122,383	106,670
Total parent shareholders' equity	411,831	390,472
Noncontrolling interests	(93)	(79)
Total shareholders' equity	411,738	390,393
Total liabilities and shareholders' equity	$ 1,784,081	$ 1,862,716

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).