DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS

The following tables present financial information of certain consolidated balance sheet captions.

Accounts Receivable, net — Accounts receivable, net were:



	December 31,
	2015			2014
	(Amounts in thousands)
Accounts receivable	$	1,032,327		$	1,107,916
Less: allowance for doubtful accounts	(43,936		)	(25,469		)
Accounts receivable, net	$	988,391		$	1,082,447

As disclosed in Note 1, we reclassified a portion of our accounts receivable to long-term within other assets, net on our December 31, 2015 and 2014 consolidated balance sheets.

Property, Plant and Equipment, net — Property, plant and equipment, net were:



	December 31,
	2015			2014
	(Amounts in thousands)
Land	$	83,475		$	76,645
Buildings and improvements	430,267			405,733
Machinery, equipment and tooling	690,566			668,710
Software, furniture and fixtures and other	409,333			379,774
Gross property, plant and equipment	1,613,641			1,530,862
Less: accumulated depreciation	(855,214		)	(836,981		)
Property, plant and equipment, net	$	758,427		$	693,881

Accrued Liabilities — Accrued liabilities were:



	December 31,
	2015		2014
	(Amounts in thousands)
Wages, compensation and other benefits	$	160,452	$	226,488
Commissions and royalties	30,574		34,194
Customer advance payments	315,510		303,527
Progress billings in excess of accumulated costs	8,085		22,098
Warranty costs and late delivery penalties	51,894		47,738
Sales and use tax	17,741		16,274
Income tax	38,747		37,451
Other	173,761		106,302
Accrued liabilities	$	796,764	$	794,072

"Other" accrued liabilities include professional fees, lease obligations, insurance, interest, freight, accrued cash dividends payable, legal and environmental matters, derivative liabilities, restructuring reserves and other items, none of which individually exceed 5% of current liabilities.

Retirement Obligations and Other Liabilities — Retirement obligations and other liabilities were:



	December 31,
	2015		2014
	(Amounts in thousands)
Pension and postretirement benefits	$	203,150	$	195,429
Deferred taxes	140,614		118,780
Legal and environmental	26,538		27,606
Uncertain tax positions	73,459		69,284
Other	45,558		41,412
Retirement obligations and other liabilities	$	489,319	$	452,511