Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and equivalents	$ 145,801	$ 433,815
Accounts receivable, net of allowance for doubtful accounts of $15,658 and $17,154 at June 30, 2018 and December 31, 2017, respectively	604,090	554,458
Current assets held for sale	1,448	1,596
Prepaid expenses and other current assets	167,036	186,999
Total current assets	918,375	1,176,868
Restricted cash	80,045	122,652
Restricted investments	44,049	44,360
Property and equipment, net	5,024,868	4,820,934
Goodwill	4,772,966	4,681,774
Intangible assets, net	1,085,775	1,087,436
Long-term assets held for sale	11,647	12,625
Other assets, net	86,819	68,032
Total assets	12,024,544	12,014,681
Current liabilities:
Accounts payable	343,870	330,523
Book overdraft	18,041	19,223
Accrued liabilities	257,874	278,039
Deferred revenue	162,463	145,197
Current portion of contingent consideration	11,688	15,803
Current liabilities held for sale	2,044	2,155
Current portion of long-term debt and notes payable	1,690	11,659
Total current liabilities	797,670	802,599
Long-term debt and notes payable	3,792,847	3,899,572
Long-term portion of contingent consideration	43,300	31,482
Other long-term liabilities	325,459	316,191
Deferred income taxes	718,627	690,767
Total liabilities	5,677,903	5,740,611
Commitments and contingencies (Note 18)
Equity:
Common shares: 263,498,672 shares issued and 263,362,026 shares outstanding at June 30, 2018; 263,660,803 shares issued and 263,494,670 shares outstanding at December 31, 2017	4,147,674	4,187,568
Additional paid-in capital	118,113	115,743
Accumulated other comprehensive income	15,106	108,413
Treasury shares: 136,646 and 166,133 shares at June 30, 2018 and December 31, 2017, respectively
Retained earnings	2,060,156	1,856,946
Total Waste Connections' equity	6,341,049	6,268,670
Noncontrolling interest in subsidiaries	5,592	5,400
Total equity	6,346,641	6,274,070
Total liabilities and shareholders' equity	$ 12,024,544	$ 12,014,681

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).

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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.