3. Supplemental Financial Information

Consolidated Balance Sheet Information

Accounts receivable, net of allowance for bad debts, consists of the following:


	December 31,
	2015			2014
	(In thousands)
Trade receivables	$	390,429		$	437,017
Value added tax receivables		14,475			24,853
Amounts held in escrow		4,966			6,450
Interest receivable		336			317
Related party receivables		167			339
Other		721			610

		411,094			469,586
Allowance for bad debts		(5,724	)		(5,724	)

Total	$	405,370		$	463,862

An analysis of the changes in our provision for bad debts for each of the three years ended December 31, 2015, 2014 and 2013, is as follows:


	For the Year Ended December 31,
	2015		2014			2013
	(In thousands)
Allowance for bad debts, beginning of year	$	5,724	$	27,340		$	5,458
Bad debt expense:
Provision for bad debts		—		—			22,513
Recovery of bad debts		—		—			—

Total bad debt expense (recovery)		—		—			22,513
Write off of uncollectible accounts against reserve		—		(21,148	)		(509	)
Other ⁽¹⁾		—		(468	)		(122	)

Allowance for bad debts, end of year	$	5,724	$	5,724		$	27,340

⁽¹⁾

Includes revaluation adjustments for non-U.S. dollar denominated receivables, which have been recorded as “Foreign currency transaction gain (loss)” in our Consolidated Statements of Operations.

See Note 8 for a discussion of our provision for bad debts and write off of uncollectible accounts against the reserve.

Prepaid expenses and other current assets consist of the following:


	December 31,
	2015		2014
	(In thousands)
Rig spare parts and supplies	$	42,804	$	56,315
Deferred mobilization costs		52,965		53,206
Prepaid insurance		4,483		12,163
Deferred tax assets ⁽¹⁾		—		15,612
Prepaid taxes		14,969		44,085
Other		4,258		4,160

Total	$	119,479	$	185,541

⁽¹⁾

We have elected to early adopt the provisions of ASU 2015-17 and are prospectively applying the classification requirements as of the beginning of 2015. Our Consolidated Balance Sheet at December 31, 2014 has not been retrospectively adjusted. See Notes 1 and 15.

Accrued liabilities consist of the following:


	December 31,
	2015		2014
	(In thousands)
Rig operating expenses	$	47,426	$	85,897
Payroll and benefits		59,787		131,664
Deferred revenue		31,542		63,209
Accrued capital project/upgrade costs		84,146		103,123
Interest payable		18,365		18,365
Personal injury and other claims		8,320		8,570
FOREX contracts Other		— 4,183		5,439 10,325

Total	$	253,769	$	426,592

Consolidated Statement of Cash Flows Information

Noncash investing activities excluded from the Consolidated Statements of Cash Flows and other supplemental cash flow information is as follows:


	December 31,
	2015			2014			2013
	(In thousands)
Accrued but unpaid capital expenditures at period end	$	84,146		$	103,123		$	86,274
Income tax benefits related to exercise of stock options		—			1,458			1,081
Common stock withheld for payroll tax obligations ⁽¹⁾		236			—			—
Cash interest payments ⁽²⁾		110,412			133,784			82,938
Cash income taxes paid (refunded), net:
U.S. federal		(21,751	)		—			62,000
Foreign		69,697			92,049			78,041
State		58			(18	)		190

⁽¹⁾

Represents the cost of 7,810 shares of common stock withheld to satisfy the payroll tax obligation incurred as a result of the vesting of restricted stock units in the first quarter of 2015. This cost is presented as a deduction from stockholders’ equity in “Treasury stock” in our Consolidated Balance Sheets at December 31, 2015.

⁽²⁾

Interest payments, net of amounts capitalized, were $94.7 million, $73.2 million and $16.5 million for the years ended December 31, 2015, 2014 and 2013, respectively.